Remove FrameGenerator::root_window_

services/ui/ws/platform_display_default.h

Index: services/ui/ws/platform_display_default.h
diff --git a/services/ui/ws/platform_display_default.h b/services/ui/ws/platform_display_default.h
index 25f4755df4bd21c1378871c80114aaa1bffdc22d..f319dd1d153de7661c0b4dff537ad6971d780f93 100644
--- a/services/ui/ws/platform_display_default.h
+++ b/services/ui/ws/platform_display_default.h
@@ -13,6 +13,7 @@
 #include "services/ui/ws/platform_display.h"
 #include "services/ui/ws/platform_display_delegate.h"
 #include "services/ui/ws/server_window.h"
+#include "services/ui/ws/server_window_observer.h"
 #include "ui/platform_window/platform_window_delegate.h"
 
 namespace ui {
@@ -26,7 +27,8 @@ namespace ws {
 // PlatformDisplay implementation that connects to a PlatformWindow and
 // FrameGenerator for Chrome OS.
 class PlatformDisplayDefault : public PlatformDisplay,
-                               public ui::PlatformWindowDelegate {
+                               public ui::PlatformWindowDelegate,
+                               public ServerWindowObserver {
  public:
   PlatformDisplayDefault(ServerWindow* root_window,
                          const display::ViewportMetrics& metrics);
@@ -66,6 +68,12 @@ class PlatformDisplayDefault : public PlatformDisplay,
   void OnAcceleratedWidgetDestroyed() override;
   void OnActivationChanged(bool active) override;
 
+  // ServerWindowObserver:
+  void OnWindowBoundsChanged(ServerWindow* window,
+                             const gfx::Rect& old_bounds,
+                             const gfx::Rect& new_bounds) override;
+  void OnWindowVisibilityChanged(ServerWindow* window) override;
+
   ServerWindow* root_window_;
 
 #if !defined(OS_ANDROID)
@@ -78,7 +86,6 @@ class PlatformDisplayDefault : public PlatformDisplay,
   display::ViewportMetrics metrics_;
   std::unique_ptr<ui::PlatformWindow> platform_window_;
   gfx::AcceleratedWidget widget_;
-  float init_device_scale_factor_;
 
   DISALLOW_COPY_AND_ASSIGN(PlatformDisplayDefault);
 };