GitLab

* Added special Ash version of tab close button, currently the same as non-Ash but more art will follow.
* Made theme frame filenames more consistent.

Part 1 of many patches coming for Ash toolbar updates.

BUG=115234
TEST=visual
TBR=sky@chromium.org

Review URL: https://chromiumcodereview.appspot.com/10217014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@133922 0039d316-1c4b-4281-b951-d872f2087c98