Do not mark CameraEnabled proto before it is removed from ChromeOS.

Partially revert changes made by https://chromiumcodereview.appspot.com/23460030


BUG=None
TBR=mnissler@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/39803003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230702 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 230702