diff --git a/metricsd/c_metrics_library.cc b/metricsd/c_metrics_library.cc
index 0503876..47a543e 100644
--- a/metricsd/c_metrics_library.cc
+++ b/metricsd/c_metrics_library.cc
@@ -66,14 +66,6 @@
   return lib->SendSparseToUMA(std::string(name), sample);
 }
 
-extern "C" int CMetricsLibrarySendUserActionToUMA(CMetricsLibrary handle,
-                                                  const char* action) {
-  MetricsLibrary* lib = reinterpret_cast<MetricsLibrary*>(handle);
-  if (lib == NULL)
-    return 0;
-  return lib->SendUserActionToUMA(std::string(action));
-}
-
 extern "C" int CMetricsLibrarySendCrashToUMA(CMetricsLibrary handle,
                                             const char* crash_kind) {
   MetricsLibrary* lib = reinterpret_cast<MetricsLibrary*>(handle);
diff --git a/metricsd/include/metrics/c_metrics_library.h b/metricsd/include/metrics/c_metrics_library.h
index 4e7e666..1e597c2 100644
--- a/metricsd/include/metrics/c_metrics_library.h
+++ b/metricsd/include/metrics/c_metrics_library.h
@@ -44,10 +44,6 @@
 int CMetricsLibrarySendSparseToUMA(CMetricsLibrary handle,
                                    const char* name, int sample);
 
-// C wrapper for MetricsLibrary::SendUserActionToUMA.
-int CMetricsLibrarySendUserActionToUMA(CMetricsLibrary handle,
-                                       const char* action);
-
 // C wrapper for MetricsLibrary::SendCrashToUMA.
 int CMetricsLibrarySendCrashToUMA(CMetricsLibrary handle,
                                   const char* crash_kind);
diff --git a/metricsd/include/metrics/metrics_library.h b/metricsd/include/metrics/metrics_library.h
index 37dda50..e160657 100644
--- a/metricsd/include/metrics/metrics_library.h
+++ b/metricsd/include/metrics/metrics_library.h
@@ -44,7 +44,6 @@
   virtual bool SendEnumToUMA(const std::string& name, int sample, int max) = 0;
   virtual bool SendBoolToUMA(const std::string& name, bool sample) = 0;
   virtual bool SendSparseToUMA(const std::string& name, int sample) = 0;
-  virtual bool SendUserActionToUMA(const std::string& action) = 0;
   virtual ~MetricsLibraryInterface() {}
 };
 
@@ -114,18 +113,6 @@
   // |sample| is the 32-bit integer value to be recorded.
   bool SendSparseToUMA(const std::string& name, int sample) override;
 
-  // Sends a user action to Chrome for transport to UMA and returns true on
-  // success. This method results in the equivalent of an asynchronous
-  // non-blocking RPC to UserMetrics::RecordAction.  The new metric must be
-  // added to chrome/tools/extract_actions.py in the Chromium repository, which
-  // should then be run to generate a hash for the new action.
-  //
-  // Until http://crosbug.com/11125 is fixed, the metric must also be added to
-  // chrome/browser/chromeos/external_metrics.cc.
-  //
-  // |action| is the user-generated event (e.g., "MuteKeyPressed").
-  bool SendUserActionToUMA(const std::string& action) override;
-
   // Sends a signal to UMA that a crash of the given |crash_kind|
   // has occurred.  Used by UMA to generate stability statistics.
   bool SendCrashToUMA(const char *crash_kind);
diff --git a/metricsd/include/metrics/metrics_library_mock.h b/metricsd/include/metrics/metrics_library_mock.h
index db56f9e..3b0b24d 100644
--- a/metricsd/include/metrics/metrics_library_mock.h
+++ b/metricsd/include/metrics/metrics_library_mock.h
@@ -34,7 +34,6 @@
                                    int max));
   MOCK_METHOD2(SendBoolToUMA, bool(const std::string& name, bool sample));
   MOCK_METHOD2(SendSparseToUMA, bool(const std::string& name, int sample));
-  MOCK_METHOD1(SendUserActionToUMA, bool(const std::string& action));
 
   bool AreMetricsEnabled() override {return metrics_enabled_;};
 };
diff --git a/metricsd/metrics_client.cc b/metricsd/metrics_client.cc
index 5d73555..a2cc38f 100644
--- a/metricsd/metrics_client.cc
+++ b/metricsd/metrics_client.cc
@@ -26,7 +26,6 @@
     kModeSendSample,
     kModeSendEnumSample,
     kModeSendSparseSample,
-    kModeSendUserAction,
     kModeSendCrosEvent,
     kModeHasConsent,
     kModeIsGuestMode,
@@ -38,7 +37,6 @@
           "        metrics_client -e   name sample max\n"
           "        metrics_client -s   name sample\n"
           "        metrics_client -v   event\n"
-          "        metrics_client -u action\n"
           "        metrics_client [-cdg]\n"
           "\n"
           "  default: send metric with integer values \n"
@@ -49,7 +47,6 @@
           "  -g: return exit status 0 if machine in guest mode, 1 otherwise\n"
           "  -s: send a sparse histogram sample\n"
           "  -t: convert sample from double seconds to int milliseconds\n"
-          "  -u: send a user action to Chrome\n"
           "  -v: send a Platform.CrOSEvent enum histogram sample\n");
   exit(1);
 }
@@ -102,14 +99,6 @@
   return 0;
 }
 
-static int SendUserAction(char* argv[], int action_index) {
-  const char* action = argv[action_index];
-  MetricsLibrary metrics_lib;
-  metrics_lib.Init();
-  metrics_lib.SendUserActionToUMA(action);
-  return 0;
-}
-
 static int SendCrosEvent(char* argv[], int action_index) {
   const char* event = argv[action_index];
   bool result;
@@ -141,7 +130,7 @@
 
   // Parse arguments
   int flag;
-  while ((flag = getopt(argc, argv, "abcegstuv")) != -1) {
+  while ((flag = getopt(argc, argv, "abcegstv")) != -1) {
     switch (flag) {
       case 'c':
         mode = kModeHasConsent;
@@ -158,9 +147,6 @@
       case 't':
         secs_to_msecs = true;
         break;
-      case 'u':
-        mode = kModeSendUserAction;
-        break;
       case 'v':
         mode = kModeSendCrosEvent;
         break;
@@ -178,8 +164,6 @@
     expected_args = 3;
   else if (mode == kModeSendSparseSample)
     expected_args = 2;
-  else if (mode == kModeSendUserAction)
-    expected_args = 1;
   else if (mode == kModeSendCrosEvent)
     expected_args = 1;
 
@@ -198,8 +182,6 @@
                        arg_index,
                        mode,
                        secs_to_msecs);
-    case kModeSendUserAction:
-      return SendUserAction(argv, arg_index);
     case kModeSendCrosEvent:
       return SendCrosEvent(argv, arg_index);
     case kModeHasConsent:
diff --git a/metricsd/metrics_library.cc b/metricsd/metrics_library.cc
index bc0aadd..263c310 100644
--- a/metricsd/metrics_library.cc
+++ b/metricsd/metrics_library.cc
@@ -200,13 +200,6 @@
              .isOk();
 }
 
-bool MetricsLibrary::SendUserActionToUMA(const std::string& action) {
-  // Deprecated.
-  // TODO(bsimonnet): Delete this method entirely once all the callers are
-  // removed (b/25818567).
-  return true;
-}
-
 bool MetricsLibrary::SendCrashToUMA(const char* crash_kind) {
   return CheckService() &&
          metricsd_proxy_->recordCrash(String16(crash_kind)).isOk();