[Sync] Move 'sync' target to sync/

chrome/browser/sync/js/js_backend.h

-// Copyright (c) 2011 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 CHROME_BROWSER_SYNC_JS_JS_BACKEND_H_
-#define CHROME_BROWSER_SYNC_JS_JS_BACKEND_H_
-#pragma once
-
-// See README.js for design comments.
-
-#include <string>
-
-namespace browser_sync {
-
-class JsArgList;
-class JsEventHandler;
-class JsReplyHandler;
-template <typename T> class WeakHandle;
-
-// Interface representing the backend of chrome://sync-internals.  A
-// JsBackend can handle messages and can emit events to a
-// JsEventHandler.
-class JsBackend {
- public:
-  // Starts emitting events to the given handler, if initialized.
-  virtual void SetJsEventHandler(
-      const WeakHandle<JsEventHandler>& event_handler) = 0;
-
-  // Processes the given message and replies via the given handler, if
-  // initialized.
-  virtual void ProcessJsMessage(
-      const std::string& name, const JsArgList& args,
-      const WeakHandle<JsReplyHandler>& reply_handler) = 0;
-
- protected:
-  virtual ~JsBackend() {}
-};
-
-}  // namespace browser_sync
-
-#endif  // CHROME_BROWSER_SYNC_JS_JS_BACKEND_H_