ui: Cleanup class/struct forward declarations

android_webview/browser/hardware_renderer.h

Index: android_webview/browser/hardware_renderer.h
diff --git a/android_webview/browser/hardware_renderer.h b/android_webview/browser/hardware_renderer.h
index 8819f86fdaa48edc27129f9a0552ada2d702aa25..2a83fda458979ced8db845aef86fba2e7faab083 100644
--- a/android_webview/browser/hardware_renderer.h
+++ b/android_webview/browser/hardware_renderer.h
@@ -13,7 +13,6 @@
 #include "cc/surfaces/frame_sink_id.h"
 #include "cc/surfaces/surface_factory_client.h"
 #include "cc/surfaces/surface_id.h"
-#include "content/public/browser/android/synchronous_compositor.h"
 
 struct AwDrawGLInfo;
 
@@ -67,8 +66,6 @@ class HardwareRenderer : public cc::SurfaceFactoryClient {
   // SurfaceFactory.
   std::unique_ptr<ChildFrame> child_frame_;
 
-  scoped_refptr<content::SynchronousCompositor::FrameFuture> frame_future_;
-
   const scoped_refptr<SurfacesInstance> surfaces_;
   cc::FrameSinkId frame_sink_id_;
   const std::unique_ptr<cc::SurfaceIdAllocator> surface_id_allocator_;