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

sync/js/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_JS_CONTROLLER_H_
-#define SYNC_JS_JS_CONTROLLER_H_
-
-// See README.js for design comments.
-
-#include <string>
-
-#include "sync/base/sync_export.h"
-
-namespace syncer {
-
-class JsEventHandler;
-template <typename T> class WeakHandle;
-
-// An interface for objects that JsEventHandlers directly interact
-// with.  JsEventHandlers can add themselves to receive events and
-// also send messages which will eventually reach the backend.
-class SYNC_EXPORT JsController {
- public:
-  // Adds an event handler which will start receiving JS events (not
-  // immediately, so this can be called in the handler's constructor).
-  // Multiple event handlers are supported, but each event handler
-  // must be added at most once.
-  //
-  // Ideally, we'd take WeakPtrs, but we need the raw pointer values
-  // to be able to look them up for removal.
-  virtual void AddJsEventHandler(JsEventHandler* event_handler) = 0;
-
-  // Removes the given event handler if it has been added.  It will
-  // immediately stop receiving any JS events.
-  virtual void RemoveJsEventHandler(JsEventHandler* event_handler) = 0;
-
- protected:
-  virtual ~JsController() {}
-};
-
-}  // namespace syncer
-
-#endif  // SYNC_JS_JS_CONTROLLER_H_