sync: Move all the js_* files into a js/ subdirectory.

chrome/browser/sync/js/js_transaction_observer.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_TRANSACTION_OBSERVER_H_
-#define CHROME_BROWSER_SYNC_JS_TRANSACTION_OBSERVER_H_
+#ifndef CHROME_BROWSER_SYNC_JS_JS_TRANSACTION_OBSERVER_H_
+#define CHROME_BROWSER_SYNC_JS_JS_TRANSACTION_OBSERVER_H_
 #pragma once
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/threading/non_thread_safe.h"
 #include "chrome/browser/sync/syncable/transaction_observer.h"
 #include "chrome/browser/sync/weak_handle.h"
 
@@ skipping 34 matching lines @@
 
   void HandleJsEvent(
     const tracked_objects::Location& from_here,
     const std::string& name, const JsEventDetails& details);
 
   DISALLOW_COPY_AND_ASSIGN(JsTransactionObserver);
 };
 
 }  // namespace browser_sync
 
-#endif  // CHROME_BROWSER_SYNC_JS_TRANSACTION_OBSERVER_H_
+#endif  // CHROME_BROWSER_SYNC_JS_JS_TRANSACTION_OBSERVER_H_