Enable TCMalloc
Enable TCMalloc

With TCMalloc now being more conservative about commitment, this change
will reenable it as the default allocator.

r=mbelshe,jamesr
Review URL: http://codereview.chromium.org/246089

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@28020 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