[Chromecast] Handle device scale factor correctly

chromecast/graphics/cast_screen.h

 // Copyright 2015 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 CHROMECAST_GRAPHICS_CAST_SCREEN_H_
 #define CHROMECAST_GRAPHICS_CAST_SCREEN_H_
 
-#include "base/callback.h"
 #include "base/macros.h"
 #include "chromecast/public/graphics_types.h"
 #include "ui/display/display.h"
 #include "ui/display/screen.h"
 
 namespace chromecast {
 namespace shell {
 class CastBrowserMainParts;
 }  // namespace shell
 
 // CastScreen is Chromecast's own minimal implementation of display::Screen.
 // Right now, it almost exactly duplicates the behavior of aura's TestScreen
 // class for necessary methods. The instantiation of CastScreen occurs in
 // CastBrowserMainParts, where its ownership is assigned to CastBrowserProcess.
 // To then subsequently access CastScreen, see CastBrowerProcess.
 class CastScreen : public display::Screen {
  public:
   ~CastScreen() override;
 
-  using DisplayResizeCallback = base::Callback<void(const Size&)>;
-  void SetDisplayResizeCallback(const DisplayResizeCallback& cb);
-
-  // Updates the primary display size.
-  void UpdateDisplaySize(const gfx::Size& size);
-
   // display::Screen overrides:
   gfx::Point GetCursorScreenPoint() override;
   bool IsWindowUnderCursor(gfx::NativeWindow window) override;
   gfx::NativeWindow GetWindowAtScreenPoint(const gfx::Point& point) override;
   int GetNumDisplays() const override;
   std::vector<display::Display> GetAllDisplays() const override;
   display::Display GetDisplayNearestWindow(gfx::NativeView view) const override;
   display::Display GetDisplayNearestPoint(
       const gfx::Point& point) const override;
   display::Display GetDisplayMatching(
       const gfx::Rect& match_rect) const override;
   display::Display GetPrimaryDisplay() const override;
   void AddObserver(display::DisplayObserver* observer) override;
   void RemoveObserver(display::DisplayObserver* observer) override;
 
  private:
   CastScreen();
 
   display::Display display_;
-  DisplayResizeCallback display_resize_cb_;
 
   friend class shell::CastBrowserMainParts;
 
   DISALLOW_COPY_AND_ASSIGN(CastScreen);
 };
 
 }  // namespace chromecast
 
 #endif  // CHROMECAST_GRAPHICS_CAST_SCREEN_H_