Move GetRootWindowController to root_window_controller.h
Remove unnecessary includes, forward decls

BUG=272460

Review URL: https://chromiumcodereview.appspot.com/24020002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@221605 0039d316-1c4b-4281-b951-d872f2087c98
22 files changed