Update OS X to use scoped_refptr<T>::get() rather than implicit "operator T*"

OS X fixes and post-Linux cleanup

BUG=110610
TBR=darin

Review URL: https://codereview.chromium.org/16402003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@206189 0039d316-1c4b-4281-b951-d872f2087c98
28 files changed