Stop thread watching on Mac to fix memory usage on mac-release-10.5/intl2.
Stop thread watching on Mac to fix memory usage
on mac-release-10.5/intl2.

TBR=jar@chromium.org
BUG=73915

Review URL: http://codereview.chromium.org/6579030

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@75853 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