Add context to gfx::Screen calls in support of simultaneous desktop+ash

ash/wm/maximize_bubble_controller.cc

Index: ash/wm/maximize_bubble_controller.cc
diff --git a/ash/wm/maximize_bubble_controller.cc b/ash/wm/maximize_bubble_controller.cc
index a08c7601b9fac76c5b59f2a08b0c14dd9f732316..cd3ef523d497136fcc3e0b9af6077c6d4bf96932 100644
--- a/ash/wm/maximize_bubble_controller.cc
+++ b/ash/wm/maximize_bubble_controller.cc
@@ -490,7 +490,8 @@ void MaximizeBubbleController::Bubble::MouseMovedOutOfHost() {
   // When we leave the bubble, we might be still be in gesture mode or over
   // the maximize button. So only close if none of the other cases apply.
   if (!owner_->frame_maximize_button()->is_snap_enabled()) {
-    gfx::Point screen_location = gfx::Screen::GetCursorScreenPoint();
+    gfx::Point screen_location =
+        ash::Shell::GetAshScreen()->GetCursorScreenPoint();
     if (!owner_->frame_maximize_button()->GetBoundsInScreen().Contains(
         screen_location)) {
         owner_->RequestDestructionThroughOwner();