Move content/child/background_sync to Blink.

content/child/blink_platform_impl.h

 // 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.
 
 #ifndef CONTENT_CHILD_BLINK_PLATFORM_IMPL_H_
 #define CONTENT_CHILD_BLINK_PLATFORM_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 25 matching lines @@
 class WaitableEvent;
 }
 
 namespace blink {
 namespace scheduler {
 class WebThreadBase;
 }
 }
 
 namespace content {
-class BackgroundSyncProvider;
+
 class NotificationDispatcher;
 class PushDispatcher;
 class ThreadSafeSender;
 class WebCryptoImpl;
 
 class CONTENT_EXPORT BlinkPlatformImpl
     : NON_EXPORTED_BASE(public blink::Platform) {
  public:
   BlinkPlatformImpl();
   explicit BlinkPlatformImpl(
@@ skipping 49 matching lines @@
       blink::WebGestureDevice device_source,
       const blink::WebFloatPoint& velocity,
       const blink::WebSize& cumulative_scroll) override;
   void didStartWorkerThread() override;
   void willStopWorkerThread() override;
   bool allowScriptExtensionForServiceWorker(
       const blink::WebURL& script_url) override;
   blink::WebCrypto* crypto() override;
   blink::WebNotificationManager* notificationManager() override;
   blink::WebPushProvider* pushProvider() override;
-  blink::WebSyncProvider* backgroundSyncProvider() override;
 
   blink::WebString domCodeStringFromEnum(int dom_code) override;
   int domEnumFromCodeString(const blink::WebString& codeString) override;
   blink::WebString domKeyStringFromEnum(int dom_key) override;
   int domKeyEnumFromString(const blink::WebString& key_string) override;
 
   // This class does *not* own the compositor thread. It is the responsibility
   // of the caller to ensure that the compositor thread is cleared before it is
   // destructed.
   void SetCompositorThread(blink::scheduler::WebThreadBase* compositor_thread);
 
  private:
   void InternalInit();
   void WaitUntilWebThreadTLSUpdate(blink::scheduler::WebThreadBase* thread);
   void UpdateWebThreadTLS(blink::WebThread* thread, base::WaitableEvent* event);
 
   bool IsMainThread() const;
 
   scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner_;
   WebThemeEngineImpl native_theme_engine_;
   WebFallbackThemeEngineImpl fallback_theme_engine_;
   base::ThreadLocalStorage::Slot current_thread_slot_;
   webcrypto::WebCryptoImpl web_crypto_;
 
   scoped_refptr<ThreadSafeSender> thread_safe_sender_;
   scoped_refptr<NotificationDispatcher> notification_dispatcher_;
   scoped_refptr<PushDispatcher> push_dispatcher_;
-  std::unique_ptr<BackgroundSyncProvider> main_thread_sync_provider_;
 
   blink::scheduler::WebThreadBase* compositor_thread_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_BLINK_PLATFORM_IMPL_H_