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

ui/gfx/screen_android.cc

 // Copyright (c) 2012 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.
 
 #include "ui/gfx/screen.h"
 
 #include "base/logging.h"
 #include "base/macros.h"
 #include "ui/gfx/android/device_display_info.h"
 #include "ui/gfx/display.h"
 #include "ui/gfx/geometry/size_conversions.h"
 
 namespace gfx {
 
 class ScreenAndroid : public Screen {
  public:
   ScreenAndroid() {}
 
   gfx::Point GetCursorScreenPoint() override { return gfx::Point(); }
 
-  gfx::NativeWindow GetWindowUnderCursor() override {
+  bool IsWindowUnderCursor(gfx::NativeWindow window) override {
     NOTIMPLEMENTED();
-    return NULL;
+    return false;
   }
 
   gfx::NativeWindow GetWindowAtScreenPoint(const gfx::Point& point) override {
     NOTIMPLEMENTED();
     return NULL;
   }
 
   gfx::Display GetPrimaryDisplay() const override {
     gfx::DeviceDisplayInfo device_info;
     const float device_scale_factor = device_info.GetDIPScale();
@@ skipping 44 matching lines @@
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ScreenAndroid);
 };
 
 Screen* CreateNativeScreen() {
   return new ScreenAndroid;
 }
 
 }  // namespace gfx