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

Fixes a number of cases either not caught by the automated tool or that
have recently regressed.

BUG=110610
TBR=darin

Review URL: https://codereview.chromium.org/18308004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@210048 0039d316-1c4b-4281-b951-d872f2087c98
50 files changed