Make CEF compliant with Google/Chromium style (issue #473).

- Add a new check_style tool based on Google's cpplint that can be used to verify compliance of pending changes and specific files/directories.
- Update existing CEF source code to be compliant with the style requirements.

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@463 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

libcef/browser_database_system.h

@@ -2,8 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef _BROWSER_DATABASE_SYSTEM_H
-#define _BROWSER_DATABASE_SYSTEM_H
+#ifndef CEF_LIBCEF_BROWSER_DATABASE_SYSTEM_H_
+#define CEF_LIBCEF_BROWSER_DATABASE_SYSTEM_H_
+#pragma once
 
 #include "base/file_path.h"
 #include "base/hash_tables.h"
@@ -101,4 +102,4 @@ class BrowserDatabaseSystem : public webkit_database::DatabaseTracker::Observer,
   static BrowserDatabaseSystem* instance_;
 };
 
-#endif  // _BROWSER_DATABASE_SYSTEM_H
+#endif  // CEF_LIBCEF_BROWSER_DATABASE_SYSTEM_H_