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/external_protocol_handler_gtk.cc

@@ -2,7 +2,7 @@
 // reserved. Use of this source code is governed by a BSD-style license that
 // can be found in the LICENSE file.
 
-#include "external_protocol_handler.h"
+#include "libcef/external_protocol_handler.h"
 
 namespace ExternalProtocolHandler {
 
@@ -14,4 +14,4 @@ bool HandleExternalProtocol(const GURL& gurl) {
   return false;
 }
 
-} // namespace ExternalProtocolHandler
+}  // namespace ExternalProtocolHandler