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

components/gcm_driver/gcm_stats_recorder_android.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_GCM_DRIVER_GCM_STATS_RECORDER_ANDROID_H_
 #define COMPONENTS_GCM_DRIVER_GCM_STATS_RECORDER_ANDROID_H_
 
 #include <deque>
 #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
   // interact with its container.
   class Delegate {
    public:
     // Called when the GCMStatsRecorderAndroid is recording activities and a new
     // activity has just been recorded.
     virtual void OnActivityRecorded() = 0;
   };
@@ skipping 19 matching lines @@
   void RecordUnregistrationSent(const std::string& app_id);
 
   // Records that the unregistration sent for |app_id| has received a response.
   // |success| indicates whether the unregistration was successful.
   void RecordUnregistrationResponse(const std::string& app_id, bool success);
 
   // Records that a data message has been received for |app_id|.
   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; }
 
  private:
   void RecordRegistration(const std::string& app_id,
                           const std::string& event,
                           const std::string& details);
 
   // Delegate made available by the container. May be a nullptr.
   Delegate* delegate_;
 
   // Toggle determining whether the recorder is recording.
   bool is_recording_ = false;
 
   // Recorded registration activities (which includes unregistrations).
   std::deque<RegistrationActivity> registration_activities_;
 
   // 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);
 };
 
 }  // namespace gcm
 
 #endif  // COMPONENTS_GCM_DRIVER_GCM_STATS_RECORDER_ANDROID_H_