Keep the GCM data intact when the user signs out of the profile

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 "base/android/jni_android.h"
 #include "base/android/jni_array.h"
 #include "base/android/jni_string.h"
 #include "base/compiler_specific.h"
@@ skipping 77 matching lines @@
 }
 
 // static
 bool GCMDriverAndroid::RegisterBindings(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 void GCMDriverAndroid::OnSignedIn() {
 }
 
+void GCMDriverAndroid::OnSignedOut() {
+}
+
 void GCMDriverAndroid::Purge() {
 }
 
 void GCMDriverAndroid::AddConnectionObserver(GCMConnectionObserver* observer) {
 }
 
 void GCMDriverAndroid::RemoveConnectionObserver(
     GCMConnectionObserver* observer) {
 }
 
@@ skipping 64 matching lines @@
       ConvertUTF8ToJavaString(env, app_id).Release());
 }
 
 void GCMDriverAndroid::SendImpl(const std::string& app_id,
                                 const std::string& receiver_id,
                                 const GCMClient::OutgoingMessage& message) {
   NOTIMPLEMENTED();
 }
 
 }  // namespace gcm