diff --git a/common/fake_prefs.h b/common/fake_prefs.h
index 9af2550..430c291 100644
--- a/common/fake_prefs.h
+++ b/common/fake_prefs.h
@@ -19,6 +19,7 @@
 
 #include <map>
 #include <string>
+#include <string_view>
 #include <vector>
 
 #include <base/macros.h>
@@ -40,7 +41,7 @@
 
   // PrefsInterface methods.
   bool GetString(const std::string& key, std::string* value) const override;
-  bool SetString(const std::string& key, const std::string& value) override;
+  bool SetString(const std::string& key, std::string_view value) override;
   bool GetInt64(const std::string& key, int64_t* value) const override;
   bool SetInt64(const std::string& key, const int64_t value) override;
   bool GetBoolean(const std::string& key, bool* value) const override;
@@ -96,7 +97,7 @@
   // Helper function to set a value of the passed |key|. It sets the type based
   // on the template parameter T.
   template <typename T>
-  void SetValue(const std::string& key, const T& value);
+  void SetValue(const std::string& key, T value);
 
   // Helper function to get a value from the map checking for invalid calls.
   // The function fails the test if you attempt to read a value  defined as a