Remove obsolete checks of ash::wm::WindowState::tracked_by_workspace() in ash::HeaderPainter.
The checks can be removed because when a user drags a maximized browser window which has just one tab the window is now restored.
(https://codereview.chromium.org/80323002)

Review URL: https://codereview.chromium.org/100793003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238684 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 238684