[Sync] Move //sync to //components/sync.

sync/js/sync_js_controller.h

-// Copyright 2012 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 SYNC_JS_SYNC_JS_CONTROLLER_H_
-#define SYNC_JS_SYNC_JS_CONTROLLER_H_
-
-#include <string>
-#include <vector>
-
-#include "base/compiler_specific.h"
-#include "base/macros.h"
-#include "base/memory/weak_ptr.h"
-#include "base/observer_list.h"
-#include "sync/base/sync_export.h"
-#include "sync/internal_api/public/util/weak_handle.h"
-#include "sync/js/js_controller.h"
-#include "sync/js/js_event_handler.h"
-
-namespace syncer {
-
-class JsBackend;
-
-// A class that mediates between the sync JsEventHandlers and the sync
-// JsBackend.
-class SYNC_EXPORT SyncJsController
-    : public JsController, public JsEventHandler,
-      public base::SupportsWeakPtr<SyncJsController> {
- public:
-  SyncJsController();
-
-  ~SyncJsController() override;
-
-  // Sets the backend to route all messages to (if initialized).
-  // Sends any queued-up messages if |backend| is initialized.
-  void AttachJsBackend(const WeakHandle<JsBackend>& js_backend);
-
-  // JsController implementation.
-  void AddJsEventHandler(JsEventHandler* event_handler) override;
-  void RemoveJsEventHandler(JsEventHandler* event_handler) override;
-
-  // JsEventHandler implementation.
-  void HandleJsEvent(const std::string& name,
-                     const JsEventDetails& details) override;
-
- private:
-  // Sets |js_backend_|'s event handler depending on how many
-  // underlying event handlers we have.
-  void UpdateBackendEventHandler();
-
-  WeakHandle<JsBackend> js_backend_;
-  base::ObserverList<JsEventHandler> js_event_handlers_;
-
-  DISALLOW_COPY_AND_ASSIGN(SyncJsController);
-};
-
-}  // namespace syncer
-
-#endif  // SYNC_JS_SYNC_JS_CONTROLLER_H_