Move loose extension files in c/b/ui/cocoa/ into the extensions/ subdir

BUG=none
TEST=compile
Review URL: http://codereview.chromium.org/6269009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@71600 0039d316-1c4b-4281-b951-d872f2087c98
13 files changed