Add support for x-webkit-speech (issue #758).

git-svn-id: http://chromiumembedded.googlecode.com/svn/trunk@1132 5089003a-bbd8-11dd-ad1f-f1f9622dbc98
Disable WebKit MediaStream feature if WebRTC support is disabled (issue #531).

git-svn-id: http://chromiumembedded.googlecode.com/svn/trunk@1133 5089003a-bbd8-11dd-ad1f-f1f9622dbc98