Update to Chromium revision 176706.

git-svn-id: http://chromiumembedded.googlecode.com/svn/trunk/cef1@988 5089003a-bbd8-11dd-ad1f-f1f9622dbc98
Linux: Fix compile errors.

git-svn-id: http://chromiumembedded.googlecode.com/svn/trunk/cef1@989 5089003a-bbd8-11dd-ad1f-f1f9622dbc98
Mac: Remove temporary workaround for an Xcode 4 build error.

git-svn-id: http://chromiumembedded.googlecode.com/svn/trunk/cef1@992 5089003a-bbd8-11dd-ad1f-f1f9622dbc98