Revert of [M55] Generalize layer mirroring for phantom windows

content/browser/renderer_host/delegated_frame_host.h

Index: content/browser/renderer_host/delegated_frame_host.h
diff --git a/content/browser/renderer_host/delegated_frame_host.h b/content/browser/renderer_host/delegated_frame_host.h
index b1decdfa16d508840246004d77ae1d5939cf14a2..e60855b6e20831b98d10ddcbb745911493a0f5b1 100644
--- a/content/browser/renderer_host/delegated_frame_host.h
+++ b/content/browser/renderer_host/delegated_frame_host.h
@@ -23,6 +23,7 @@
 #include "ui/compositor/compositor_observer.h"
 #include "ui/compositor/compositor_vsync_manager.h"
 #include "ui/compositor/layer.h"
+#include "ui/compositor/layer_owner_delegate.h"
 #include "ui/events/event.h"
 #include "ui/gfx/geometry/rect_conversions.h"
 
@@ -84,6 +85,7 @@
 class CONTENT_EXPORT DelegatedFrameHost
     : public ui::CompositorObserver,
       public ui::CompositorVSyncManager::Observer,
+      public ui::LayerOwnerDelegate,
       public ui::ContextFactoryObserver,
       public DelegatedFrameEvictorClient,
       public cc::SurfaceFactoryClient,
@@ -105,6 +107,9 @@
   // ui::CompositorVSyncManager::Observer implementation.
   void OnUpdateVSyncParameters(base::TimeTicks timebase,
                                base::TimeDelta interval) override;
+
+  // ui::LayerOwnerObserver implementation.
+  void OnLayerRecreated(ui::Layer* old_layer, ui::Layer* new_layer) override;
 
   // ImageTransportFactoryObserver implementation.
   void OnLostResources() override;