Remove the old type system for proxied resources. These were no longer being used.

ppapi/proxy/ppb_video_capture_proxy.cc

Index: ppapi/proxy/ppb_video_capture_proxy.cc
diff --git a/ppapi/proxy/ppb_video_capture_proxy.cc b/ppapi/proxy/ppb_video_capture_proxy.cc
index e9573158938f4a4e15b5fec0fa398d338f48c988..7c5c8a0a66a318c68ed77f014274353772c19349 100644
--- a/ppapi/proxy/ppb_video_capture_proxy.cc
+++ b/ppapi/proxy/ppb_video_capture_proxy.cc
@@ -149,9 +149,6 @@ class VideoCapture : public ppapi::thunk::PPB_VideoCapture_API,
   VideoCapture(const HostResource& resource);
   virtual ~VideoCapture();
 
-  // Resource overrides.
-  virtual VideoCapture* AsVideoCapture() OVERRIDE;
-
   // ResourceObjectBase overrides.
   virtual ppapi::thunk::PPB_VideoCapture_API* AsPPB_VideoCapture_API() OVERRIDE;
 
@@ -261,10 +258,6 @@ VideoCapture::VideoCapture(const HostResource& resource)
 VideoCapture::~VideoCapture() {
 }
 
-VideoCapture* VideoCapture::AsVideoCapture() {
-  return this;
-}
-
 ppapi::thunk::PPB_VideoCapture_API* VideoCapture::AsPPB_VideoCapture_API() {
   return this;
 }