Update to Chromium revision 280796.
- Mac: Remove Carbon interpose library (see http://crbug.com/157130).
- Remove unused LOGSEVERITY_ERROR_REPORT value (see http://crbug.com/352378).
- CefURLRequest in the render process will now always have the UR_FLAG_REPORT_LOAD_TIMING flag set (see http://crbug.com/376025#c15).
- Change CefGeolocationHandler::OnRequestGeolocationPermission return value from void to boolean.

git-svn-id: http://chromiumembedded.googlecode.com/svn/trunk/cef3@1753 5089003a-bbd8-11dd-ad1f-f1f9622dbc98
Linux: Fix release build compile errors (issue #1316)

git-svn-id: http://chromiumembedded.googlecode.com/svn/trunk/cef3@1754 5089003a-bbd8-11dd-ad1f-f1f9622dbc98