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: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@64120 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser