gfx::Screen: Replace GetWindowUnderCursor() with IsWindowUnderCursor().

ui/views/mus/screen_mus.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_VIEWS_MUS_SCREEN_MUS_H_
 #define UI_VIEWS_MUS_SCREEN_MUS_H_
 
 #include <vector>
 
 #include "base/observer_list.h"
@@ skipping 26 matching lines @@
  private:
   int FindDisplayIndexById(int64_t id) const;
 
   // Invoked when a display changed in some weay, including being added.
   // If |is_primary| is true, |changed_display| is the primary display.
   void ProcessDisplayChanged(const display::Display& changed_display,
                              bool is_primary);
 
   // display::Screen:
   gfx::Point GetCursorScreenPoint() override;
-  gfx::NativeWindow GetWindowUnderCursor() override;
+  bool IsWindowUnderCursor(gfx::NativeWindow window) override;
   gfx::NativeWindow GetWindowAtScreenPoint(const gfx::Point& point) override;
   display::Display GetPrimaryDisplay() const override;
   display::Display GetDisplayNearestWindow(gfx::NativeView view) const override;
   display::Display GetDisplayNearestPoint(
       const gfx::Point& point) const override;
   int GetNumDisplays() const override;
   std::vector<display::Display> GetAllDisplays() const override;
   display::Display GetDisplayMatching(
       const gfx::Rect& match_rect) const override;
   void AddObserver(display::DisplayObserver* observer) override;
@@ skipping 11 matching lines @@
   mojo::Binding<mus::mojom::DisplayManagerObserver>
       display_manager_observer_binding_;
   base::ObserverList<display::DisplayObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenMus);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_MUS_SCREEN_MUS_H_