Revert of List message decryption failures on chrome://gcm-internals

components/gcm_driver/gcm_stats_recorder_android.h

Index: components/gcm_driver/gcm_stats_recorder_android.h
diff --git a/components/gcm_driver/gcm_stats_recorder_android.h b/components/gcm_driver/gcm_stats_recorder_android.h
index ea339aae3ea647b01ab594964b7c62afff30afce..dbcdc2dff9f7e4b457ef2c8e1571d5b96b418e4d 100644
--- a/components/gcm_driver/gcm_stats_recorder_android.h
+++ b/components/gcm_driver/gcm_stats_recorder_android.h
@@ -9,17 +9,15 @@
 #include <string>
 
 #include "base/macros.h"
-#include "components/gcm_driver/crypto/gcm_encryption_provider.h"
 #include "components/gcm_driver/gcm_activity.h"
 
 namespace gcm {
 
+struct RecordedActivities;
+
 // Stats recorder for Android, used for recording stats and activities on the
 // GCM Driver level for debugging purposes. Based on the GCMStatsRecorder, as
 // defined in the GCM Engine, which does not exist on Android.
-//
-// Note that this class, different from the GCMStatsRecorder(Impl), is expected
-// to be used on the UI thread.
 class GCMStatsRecorderAndroid {
  public:
   // A delegate interface that allows the GCMStatsRecorderAndroid instance to
@@ -59,10 +57,6 @@
   void RecordDataMessageReceived(const std::string& app_id,
                                  int message_byte_size);
 
-  // Records a message decryption failure caused by |reason| for |app_id|.
-  void RecordDecryptionFailure(const std::string& app_id,
-                               GCMEncryptionProvider::DecryptionFailure reason);
-
   bool is_recording() const { return is_recording_; }
   void set_is_recording(bool recording) { is_recording_ = recording; }
 
@@ -83,9 +77,6 @@
   // Recorded received message activities.
   std::deque<ReceivingActivity> receiving_activities_;
 
-  // Recorded message decryption failure activities.
-  std::deque<DecryptionFailureActivity> decryption_failure_activities_;
-
   DISALLOW_COPY_AND_ASSIGN(GCMStatsRecorderAndroid);
 };