Revert 171333 - Memory issues on Mac

      chrome: Use skia::RefPtr for skia ref-counted objects.

BUG=163454
R=sky
Depends on: https://codereview.chromium.org/11299262
NOTRY=true

Review URL: https://chromiumcodereview.appspot.com/11280251

TBR=danakj@chromium.org
Review URL: https://codereview.chromium.org/11439020

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@171347 0039d316-1c4b-4281-b951-d872f2087c98