Make GCMDriver::GetInstanceIDHandler protected, to avoid misuse

components/gcm_driver/gcm_driver_android.cc

 // Copyright 2014 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.
 
 #include "components/gcm_driver/gcm_driver_android.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/android/context_utils.h"
@@ skipping 181 matching lines @@
   return base::Time();
 }
 
 void GCMDriverAndroid::SetLastTokenFetchTime(const base::Time& time) {
   NOTIMPLEMENTED();
 }
 
 void GCMDriverAndroid::WakeFromSuspendForHeartbeat(bool wake) {
 }
 
-InstanceIDHandler* GCMDriverAndroid::GetInstanceIDHandler() {
+InstanceIDHandler* GCMDriverAndroid::GetInstanceIDHandlerInternal() {
   // Not supported for Android.
   return NULL;
 }
 
 void GCMDriverAndroid::AddHeartbeatInterval(const std::string& scope,
                                             int interval_ms) {
 }
 
 void GCMDriverAndroid::RemoveHeartbeatInterval(const std::string& scope) {
 }
@@ skipping 44 matching lines @@
   NOTIMPLEMENTED();
 }
 
 void GCMDriverAndroid::RecordDecryptionFailure(
     const std::string& app_id,
     GCMEncryptionProvider::DecryptionResult result) {
   recorder_.RecordDecryptionFailure(app_id, result);
 }
 
 }  // namespace gcm