Turning back on gold as it should now be on the bots.

BUG=http://code.google.com/p/chromium/issues/detail?id=108251
TEST=None
R=bungeman@google.com
Review URL: https://codereview.chromium.org/12328042

git-svn-id: http://gyp.googlecode.com/svn/trunk@1581 78cadc50-ecff-11dd-a971-7dbc132099af