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: http://src.chromium.org/svn/trunk/src@28020 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 5f26d521feb1b3a8fc2942bcb32b566f9f75a0d2
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