Convert URLLoader to the new proxy design

ppapi/c/ppp_instance.h

Index: ppapi/c/ppp_instance.h
diff --git a/ppapi/c/ppp_instance.h b/ppapi/c/ppp_instance.h
index bdc2883813fb755d590048124d5327b30397ddf5..bc65b1f8e99d5cc329e7f5c958dd06aefcb61d9b 100644
--- a/ppapi/c/ppp_instance.h
+++ b/ppapi/c/ppp_instance.h
@@ -3,7 +3,7 @@
  * found in the LICENSE file.
  */
 
-/* From ppp_instance.idl modified Thu Jun 28 15:08:39 2012. */
+/* From ppp_instance.idl modified Mon Dec 10 21:15:00 2012. */
 
 #ifndef PPAPI_C_PPP_INSTANCE_H_
 #define PPAPI_C_PPP_INSTANCE_H_
@@ -146,11 +146,12 @@ struct PPP_Instance_1_1 {
   void (*DidChangeFocus)(PP_Instance instance, PP_Bool has_focus);
   /**
    * HandleDocumentLoad() is called after initialize for a full-frame
-   * module that was instantiated based on the MIME type of a DOMWindow
+   * instance that was instantiated based on the MIME type of a DOMWindow
    * navigation. This situation only applies to modules that are pre-registered
    * to handle certain MIME types. If you haven't specifically registered to
-   * handle a MIME type or aren't positive this applies to you, your
-   * implementation of this function can just return <code>PP_FALSE</code>.
+   * handle a MIME type or aren't positive this applies to you (Native Client
+   * plugins can't register for MIME type handling), your implementation of
+   * this function can just return <code>PP_FALSE</code>.
    *
    * The given <code>url_loader</code> corresponds to a
    * <code>PPB_URLLoader</code> instance that is already opened. Its response
@@ -163,13 +164,9 @@ struct PPP_Instance_1_1 {
    * data. In response to this method, the module should call
    * ReadResponseBody() to read the incoming data.
    *
-   * @param[in] instance A <code>PP_Instance</code> identifying the instance
-   * that should do the load.
-   *
-   * @param[in] url_loader An open <code>PPB_URLLoader</code> instance.
-   *
    * @return <code>PP_TRUE</code> if the data was handled,
-   * <code>PP_FALSE</code> otherwise.
+   * <code>PP_FALSE</code> otherwise. If you return false, the load will be
+   * canceled for you.
    */
   PP_Bool (*HandleDocumentLoad)(PP_Instance instance, PP_Resource url_loader);
 };