Move some cros settings code to chromeos/settings

BUG=270135
For numerous #include changes:
TBR=sky@chromium.org

Review URL: https://codereview.chromium.org/26732002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@228017 0039d316-1c4b-4281-b951-d872f2087c98
Add self to watchlist for mojo

TBR=darin@chromium.org
BUG=

Review URL: https://codereview.chromium.org/26879002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@228018 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 228018