Move message flags into a separate header that can be used
outside the views system.  Mac will need this as well when
implementing message boxes.

Review URL: http://codereview.chromium.org/56026

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@12722 0039d316-1c4b-4281-b951-d872f2087c98
15 files changed