Delete testing profile on UI thread.
Delete testing profile on UI thread.

Fixes a MAC-only test caused by the changes of r44036.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/1512031

git-svn-id: http://src.chromium.org/svn/trunk/src@44089 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 48cb4c3a0124bb9ce3793445c4f8f42388602b39
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser