Make InstanceIDBridge fully async to fix strict mode violations

components/gcm_driver/instance_id/instance_id_impl.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_impl.h"
 
 #include <stdint.h>
 
 #include <algorithm>
 #include <memory>
@@ skipping 196 matching lines @@
 void InstanceIDImpl::OnDeleteTokenCompleted(
     const DeleteTokenCallback& callback,
     gcm::GCMClient::Result result) {
   callback.Run(GCMClientResultToInstanceIDResult(result));
 }
 
 void InstanceIDImpl::OnDeleteIDCompleted(
     const DeleteIDCallback& callback,
     gcm::GCMClient::Result result) {
   callback.Run(GCMClientResultToInstanceIDResult(result));
+  // Now |this| may have been deleted.
 }
 
 void InstanceIDImpl::GetInstanceIDDataCompleted(
     const std::string& instance_id,
     const std::string& extra_data) {
   id_ = instance_id;
 
   if (extra_data.empty()) {
     creation_time_ = base::Time();
   } else {
@@ skipping 36 matching lines @@
   id_.erase(std::remove(id_.begin(), id_.end(), '='), id_.end());
 
   creation_time_ = base::Time::Now();
 
   // Save to the persistent store.
   handler_->AddInstanceIDData(
       app_id(), id_, base::Int64ToString(creation_time_.ToInternalValue()));
 }
 
 }  // namespace instance_id