Rename ActionExitCode to ErrorCode

Nowadays ActionExitCode is used throughout the codebase so use a more
generic name to reflect this.

BUG=chromium:216507
TEST=unit tests pass

Change-Id: I23d1d7e2676443251dbc42ed137fd018aadfa8a3
Reviewed-on: https://gerrit.chromium.org/gerrit/49512
Reviewed-by: Don Garrett <dgarrett@chromium.org>
Commit-Queue: David Zeuthen <zeuthen@chromium.org>
Tested-by: David Zeuthen <zeuthen@chromium.org>
diff --git a/test_utils.h b/test_utils.h
index 30f1f89..e8f337d 100644
--- a/test_utils.h
+++ b/test_utils.h
@@ -195,7 +195,7 @@
     if (this->HasOutputPipe()) {
       this->SetOutputObject(out_obj_);
     }
-    this->processor_->ActionComplete(this, kActionCodeSuccess);
+    this->processor_->ActionComplete(this, kErrorCodeSuccess);
   }
   static std::string StaticType() { return "ObjectFeederAction"; }
   std::string Type() const { return StaticType(); }
@@ -229,7 +229,7 @@
     if (this->HasInputObject()) {
       object_ = this->GetInputObject();
     }
-    this->processor_->ActionComplete(this, kActionCodeSuccess);
+    this->processor_->ActionComplete(this, kErrorCodeSuccess);
   }
   static std::string StaticType() { return "ObjectCollectorAction"; }
   std::string Type() const { return StaticType(); }