Clean up infobar-related theme images.
* Most images had duplicate copies inside and outside common/. Left only the
ones in common/.
* Renamed a few image files and a few resource IDs to try and make all the names
of files and IDs match, and all the names have a similar structure.
* Removed a few completely-unused files and identifiers.
* While I'm here, remove the empty "osx" subdirectories.
BUG=none
TEST=none
R=bulach@chromium.org, dfalcantara@chromium.org, fischman@chromium.org, oshima@chromium.org
Review URL: https://codereview.chromium.org/
207553009
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@259642 0039d316-1c4b-4281-b951-d872f2087c98