Move host resource from the proxy to the shared_impl.

ppapi/proxy/ppb_image_data_proxy.cc

Index: ppapi/proxy/ppb_image_data_proxy.cc
diff --git a/ppapi/proxy/ppb_image_data_proxy.cc b/ppapi/proxy/ppb_image_data_proxy.cc
index 18f9e02c38a69a726672e954639c0cf4b95ca6a6..dec6efc4bf42638e95736ec59d29cd9035590221 100644
--- a/ppapi/proxy/ppb_image_data_proxy.cc
+++ b/ppapi/proxy/ppb_image_data_proxy.cc
@@ -13,14 +13,16 @@
 #include "ppapi/c/pp_completion_callback.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/c/pp_resource.h"
-#include "ppapi/proxy/host_resource.h"
 #include "ppapi/proxy/plugin_dispatcher.h"
 #include "ppapi/proxy/plugin_resource_tracker.h"
 #include "ppapi/proxy/ppapi_messages.h"
+#include "ppapi/shared_impl/host_resource.h"
 #include "ppapi/thunk/thunk.h"
 #include "skia/ext/platform_canvas.h"
 #include "ui/gfx/surface/transport_dib.h"
 
+using ppapi::HostResource;
+
 namespace pp {
 namespace proxy {
 
@@ -80,10 +82,6 @@ ImageData::~ImageData() {
   return this;
 }
 
-ImageData* ImageData::AsImageData() {
-  return this;
-}
-
 PP_Bool ImageData::Describe(PP_ImageDataDesc* desc) {
   memcpy(desc, &desc_, sizeof(PP_ImageDataDesc));
   return PP_TRUE;