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

chrome/browser/sync/js/js_event_details.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_EVENT_DETAILS_H_
-#define CHROME_BROWSER_SYNC_JS_EVENT_DETAILS_H_
+#ifndef CHROME_BROWSER_SYNC_JS_JS_EVENT_DETAILS_H_
+#define CHROME_BROWSER_SYNC_JS_JS_EVENT_DETAILS_H_
 #pragma once
 
 // See README.js for design comments.
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
 #include "base/values.h"
 #include "chrome/browser/sync/shared_value.h"
 
@@ skipping 16 matching lines @@
   std::string ToString() const;
 
   // Copy constructor and assignment operator welcome.
 
  private:
   scoped_refptr<const SharedValue<DictionaryValue> > details_;
 };
 
 }  // namespace browser_sync
 
-#endif  // CHROME_BROWSER_SYNC_JS_EVENT_DETAILS_H_
+#endif  // CHROME_BROWSER_SYNC_JS_JS_EVENT_DETAILS_H_