Make GCMDriver::GetInstanceIDHandler protected, to avoid misuse

components/gcm_driver/instance_id/instance_id_driver.cc

 // 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.
 
 #include "components/gcm_driver/instance_id/instance_id_driver.h"
 
 #include "base/metrics/field_trial.h"
 #include "build/build_config.h"
+#include "components/gcm_driver/gcm_driver.h"
 #include "components/gcm_driver/instance_id/instance_id.h"
 
 namespace instance_id {
 
 namespace {
 #if !defined(OS_ANDROID)
 const char kInstanceIDFieldTrialName[] = "InstanceID";
 const char kInstanceIDFieldTrialEnabledGroupName[] = "Enabled";
 #endif    // !defined(OS_ANDROID)
 }  // namespace
@@ skipping 15 matching lines @@
 }
 
 InstanceIDDriver::~InstanceIDDriver() {
 }
 
 InstanceID* InstanceIDDriver::GetInstanceID(const std::string& app_id) {
   auto iter = instance_id_map_.find(app_id);
   if (iter != instance_id_map_.end())
     return iter->second.get();
 
-  scoped_ptr<InstanceID> instance_id = InstanceID::Create(app_id, gcm_driver_);
+  gcm::InstanceIDHandler* handler = gcm_driver_->GetInstanceIDHandlerInternal();
+
+  scoped_ptr<InstanceID> instance_id = InstanceID::Create(app_id, handler);
   InstanceID* instance_id_ptr = instance_id.get();
   instance_id_map_.insert(std::make_pair(app_id, std::move(instance_id)));
   return instance_id_ptr;
 }
 
 void InstanceIDDriver::RemoveInstanceID(const std::string& app_id) {
   instance_id_map_.erase(app_id);
 }
 
 bool InstanceIDDriver::ExistsInstanceID(const std::string& app_id) const {
   return instance_id_map_.find(app_id) != instance_id_map_.end();
 }
 
 }  // namespace instance_id