Remove now-unnecessary wrappers around gfx::Screen::GetScreen()

ash/content/keyboard_overlay/keyboard_overlay_delegate_unittest.cc

Index: ash/content/keyboard_overlay/keyboard_overlay_delegate_unittest.cc
diff --git a/ash/content/keyboard_overlay/keyboard_overlay_delegate_unittest.cc b/ash/content/keyboard_overlay/keyboard_overlay_delegate_unittest.cc
index ff206b3372cd3231caf6b88f54db00a93e0e22f3..124513ae3c764379035ab44a3774704deffd2a88 100644
--- a/ash/content/keyboard_overlay/keyboard_overlay_delegate_unittest.cc
+++ b/ash/content/keyboard_overlay/keyboard_overlay_delegate_unittest.cc
@@ -48,7 +48,8 @@ TEST_P(KeyboardOverlayDelegateTest, ShowAndClose) {
             widget->GetNativeWindow()->GetRootWindow());
 
   // The widget is horizontally centered at the bottom of the work area.
-  gfx::Rect work_area = Shell::GetScreen()->GetPrimaryDisplay().work_area();
+  gfx::Rect work_area =
+      gfx::Screen::GetScreen()->GetPrimaryDisplay().work_area();
   gfx::Rect bounds = widget->GetRestoredBounds();
   EXPECT_EQ(work_area.CenterPoint().x(), bounds.CenterPoint().x());
   EXPECT_EQ(work_area.bottom(), bounds.bottom());