mus: Remove aura version of WindowCompositorFrameSink.

content/browser/compositor/mus_browser_compositor_output_surface.h

Index: content/browser/compositor/mus_browser_compositor_output_surface.h
diff --git a/content/browser/compositor/mus_browser_compositor_output_surface.h b/content/browser/compositor/mus_browser_compositor_output_surface.h
index c5ee24d3aca2e3d529db4a769a69d4475104df30..2ae3a4f16903dcdc3fa30ae64161bea13555f1dd 100644
--- a/content/browser/compositor/mus_browser_compositor_output_surface.h
+++ b/content/browser/compositor/mus_browser_compositor_output_surface.h
@@ -16,13 +16,16 @@
 
 namespace aura {
 class Window;
-class WindowCompositorFrameSink;
 }
 
 namespace gpu {
 class GpuMemoryBufferManager;
 }
 
+namespace ui {
+class WindowCompositorFrameSink;
+}
+
 namespace content {
 
 // Adapts a WebGraphicsContext3DCommandBufferImpl into a
@@ -68,7 +71,7 @@ class MusBrowserCompositorOutputSurface
   const gpu::Mailbox& GetMailboxFromResourceId(uint32_t id);
 
   aura::Window* window_;
-  std::unique_ptr<aura::WindowCompositorFrameSink> compositor_frame_sink_;
+  std::unique_ptr<ui::WindowCompositorFrameSink> compositor_frame_sink_;
   std::vector<uint32_t> free_resource_ids_;
   std::vector<gpu::Mailbox> mailboxes_;
   cc::BeginFrameSource* begin_frame_source_;