Revert 240542 "Make sure the dragged window is smaller than work..."

Faling in ash_unittests DragWindowResizerTest.WindowDragWithMultiDisplays:
http://build.chromium.org/p/chromium.chromiumos/builders/Linux%20ChromiumOS%20Tests%20%281%29/builds/37164
http://build.chromium.org/p/chromium.chromiumos/builders/Linux%20ChromiumOS%20Tests%20%28dbg%29%281%29/builds/27462
http://build.chromium.org/p/chromium.memory/builders/Linux%20Chromium%20OS%20ASAN%20Tests%20%281%29/builds/14494

> Make sure the dragged window is smaller than work area in the target display.
> 
> - makes sure that minimum amount of window is visible when dropped.
> 
> - When moving a window to another due to display disconnect, try to keep relative position in the work are, rather than absolute position to the root window.
> 
> BUG=321702
> TEST=covered by test
> RootWindowController::MoveWindows_Basic
> DragWindowResizerTest::WindowDragWithMultiDisplays
> 
> Review URL: https://codereview.chromium.org/93873013

TBR=oshima@chromium.org

Review URL: https://codereview.chromium.org/108343005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@240587 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 240587