[Chromecast] Handle device scale factor correctly

chromecast/graphics/cast_screen.h

Index: chromecast/graphics/cast_screen.h
diff --git a/chromecast/graphics/cast_screen.h b/chromecast/graphics/cast_screen.h
index a8d497c3e3321cb9ea6f7adb5b02079cdf3902a2..c0e0b59768f33aa1d1aefe5055aa9ed29bf6a7f0 100644
--- a/chromecast/graphics/cast_screen.h
+++ b/chromecast/graphics/cast_screen.h
@@ -5,7 +5,6 @@
 #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"
@@ -25,12 +24,6 @@ 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;
@@ -47,10 +40,9 @@ class CastScreen : public display::Screen {
   void RemoveObserver(display::DisplayObserver* observer) override;
 
  private:
-  CastScreen();
+  CastScreen(const gfx::Size& size);
 
   display::Display display_;
-  DisplayResizeCallback display_resize_cb_;
 
   friend class shell::CastBrowserMainParts;