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

include/internal/cef_string_multimap.h

@@ -27,11 +27,12 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-#ifndef _CEF_STRING_MULTIMAP_H
-#define _CEF_STRING_MULTIMAP_H
+#ifndef CEF_INCLUDE_INTERNAL_CEF_STRING_MULTIMAP_H_
+#define CEF_INCLUDE_INTERNAL_CEF_STRING_MULTIMAP_H_
+#pragma once
 
-#include "cef_export.h"
-#include "cef_string.h"
+#include "include/internal/cef_export.h"
+#include "include/internal/cef_string.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -101,4 +102,4 @@ CEF_EXPORT void cef_string_multimap_free(cef_string_multimap_t map);
 }
 #endif
 
-#endif // _CEF_STRING_MULTIMAP_H
+#endif  // CEF_INCLUDE_INTERNAL_CEF_STRING_MULTIMAP_H_