Mac: Enable fastbuild.
Mac: Enable fastbuild.

BUG=none
TEST=xcode passes -g1 to g++.
TBR=mark
Review URL: http://codereview.chromium.org/2853028

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@51597 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