Revert 64094 - Mac: turn on file access checks for the UI thread.
Revert 64094 - Mac: turn on file access checks for the UI thread.

BUG=60211
TEST=bots

Review URL: http://codereview.chromium.org/4144003

TBR=thakis@chromium.org
Review URL: http://codereview.chromium.org/4208001

git-svn-id: http://src.chromium.org/svn/trunk/src@64120 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 848b906a2fb4e241101aebd1d0b2f00eef757057
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