Another attempt at landing this patch....

webkit/glue/webplugin.h

Index: webkit/glue/webplugin.h
===================================================================
--- webkit/glue/webplugin.h	(revision 22262)
+++ webkit/glue/webplugin.h	(working copy)
@@ -131,6 +131,10 @@
   virtual void ResourceClientDeleted(
       WebPluginResourceClient* resource_client) {}
 
+  // Defers the loading of the resource identified by resource_id. This is
+  // controlled by the defer parameter.
+  virtual void SetDeferResourceLoading(int resource_id, bool defer) = 0;
+
  private:
   DISALLOW_EVIL_CONSTRUCTORS(WebPlugin);
 };
@@ -146,8 +150,7 @@
                                   const std::string& headers,
                                   uint32 expected_length,
                                   uint32 last_modified,
-                                  bool request_is_seekable,
-                                  bool* cancel) = 0;
+                                  bool request_is_seekable) = 0;
   virtual void DidReceiveData(const char* buffer, int length,
                               int data_offset) = 0;
   virtual void DidFinishLoading() = 0;