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

headless/lib/browser/headless_screen.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 HEADLESS_LIB_BROWSER_HEADLESS_SCREEN_H_
 #define HEADLESS_LIB_BROWSER_HEADLESS_SCREEN_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "ui/aura/window_observer.h"
@@ skipping 33 matching lines @@
   gfx::Transform GetUIScaleTransform() const;
 
   // WindowObserver overrides:
   void OnWindowBoundsChanged(aura::Window* window,
                              const gfx::Rect& old_bounds,
                              const gfx::Rect& new_bounds) override;
   void OnWindowDestroying(aura::Window* window) override;
 
   // gfx::Screen overrides:
   gfx::Point GetCursorScreenPoint() override;
-  gfx::NativeWindow GetWindowUnderCursor() override;
+  bool IsWindowUnderCursor(gfx::NativeWindow window) override;
   gfx::NativeWindow GetWindowAtScreenPoint(const gfx::Point& point) override;
   int GetNumDisplays() const override;
   std::vector<gfx::Display> GetAllDisplays() const override;
   gfx::Display GetDisplayNearestWindow(gfx::NativeView view) const override;
   gfx::Display GetDisplayNearestPoint(const gfx::Point& point) const override;
   gfx::Display GetDisplayMatching(const gfx::Rect& match_rect) const override;
   gfx::Display GetPrimaryDisplay() const override;
   void AddObserver(gfx::DisplayObserver* observer) override;
   void RemoveObserver(gfx::DisplayObserver* observer) override;
 
  private:
   explicit HeadlessScreen(const gfx::Rect& screen_bounds);
 
   aura::WindowTreeHost* host_;
   gfx::Display display_;
   float ui_scale_;
 
   DISALLOW_COPY_AND_ASSIGN(HeadlessScreen);
 };
 
 }  // namespace headless
 
 #endif  // HEADLESS_LIB_BROWSER_HEADLESS_SCREEN_H_