Initialize NotificationDispatcher::next_notification_id_ to 0.

content/child/notifications/notification_dispatcher.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 "content/child/notifications/notification_dispatcher.h"
 
 #include "base/message_loop/message_loop_proxy.h"
 #include "content/child/notifications/notification_manager.h"
 #include "content/child/thread_safe_sender.h"
 #include "content/child/worker_thread_task_runner.h"
 #include "content/common/platform_notification_messages.h"
 
 namespace content {
 
 NotificationDispatcher::NotificationDispatcher(
     ThreadSafeSender* thread_safe_sender)
     : main_thread_loop_proxy_(base::MessageLoopProxy::current()),
-      thread_safe_sender_(thread_safe_sender) {
+      thread_safe_sender_(thread_safe_sender),
+      next_notification_id_(0) {
 }
 
 NotificationDispatcher::~NotificationDispatcher() {}
 
 int NotificationDispatcher::GenerateNotificationId(int thread_id) {
   base::AutoLock lock(notification_id_map_lock_);
   notification_id_map_[next_notification_id_] = thread_id;
   return next_notification_id_++;
 }
 
@@ skipping 34 matching lines @@
 
 bool NotificationDispatcher::ShouldHandleMessage(const IPC::Message& msg) {
   // The thread-safe message filter is responsible for handling all the messages
   // except for the routed permission-request-completed message, which will be
   // picked up by the RenderFrameImpl instead.
   return IPC_MESSAGE_CLASS(msg) == PlatformNotificationMsgStart &&
          msg.type() != PlatformNotificationMsg_PermissionRequestComplete::ID;
 }
 
 }  // namespace content