Remove webkit::ppapi::Resource.

ppapi/shared_impl/resource_tracker.h

Index: ppapi/shared_impl/resource_tracker.h
diff --git a/ppapi/shared_impl/resource_tracker.h b/ppapi/shared_impl/resource_tracker.h
index 04230d9e13715459b2b9bd5315ae81bc83398d08..b631653c275eaa9fce6809eb3d6b95e1ee16da3d 100644
--- a/ppapi/shared_impl/resource_tracker.h
+++ b/ppapi/shared_impl/resource_tracker.h
@@ -58,6 +58,11 @@ class ResourceTracker {
   // the given resource. It's called from the resource destructor.
   virtual void RemoveResource(Resource* object);
 
+  // Calls LastPluginRefWasDeleted on the given resource object. This is
+  // provided because the derived class in webkit/plugins/ppapi needs to
+  // perform additional operations at this time.
+  virtual void LastPluginRefWasDeleted(Resource* object);
+
  private:
   typedef std::set<PP_Resource> ResourceSet;