Make GCMDriver::GetInstanceIDHandler protected, to avoid misuse

components/gcm_driver/gcm_driver_desktop.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_desktop.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 802 matching lines @@
 
   last_token_fetch_time_ = time;
 
   io_thread_->PostTask(
       FROM_HERE,
       base::Bind(&GCMDriverDesktop::IOWorker::SetLastTokenFetchTime,
                  base::Unretained(io_worker_.get()),
                  time));
 }
 
-InstanceIDHandler* GCMDriverDesktop::GetInstanceIDHandler() {
+InstanceIDHandler* GCMDriverDesktop::GetInstanceIDHandlerInternal() {
   return this;
 }
 
 void GCMDriverDesktop::GetToken(
     const std::string& app_id,
     const std::string& authorized_entity,
     const std::string& scope,
     const std::map<std::string, std::string>& options,
     const GetTokenCallback& callback) {
   DCHECK(!app_id.empty());
@@ skipping 488 matching lines @@
 
   if (std::get<1>(a) < std::get<1>(b))
     return true;
   if (std::get<1>(a) > std::get<1>(b))
     return false;
 
   return std::get<2>(a) < std::get<2>(b);
 }
 
 }  // namespace gcm