ppapi_proxy: Support loading and reading urls. Proxy URLLoader....

src/shared/ppapi_proxy/plugin_upcall.cc

 // Copyright (c) 2010 The Native Client Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
 //
 // This is an early draft of background thread support.
 // Until it is complete, we assume that all functions proxy functions
 // (but CallOnMainThread) are called on the main thread.
 //
@@ skipping 89 matching lines @@
     NaClSrpcClosure* done,
     int32_t callback_id,
     int32_t result) {
   NACL_UNTESTED();
   NaClSrpcClosureRunner runner(done);
   rpc->result = NACL_SRPC_RESULT_APP_ERROR;
   PP_CompletionCallback callback = PP_BlockUntilComplete();
   {
     CallbackTableMutexLock ml(&upcall_mutex);
     if (callback_table != NULL) {
-      callback = callback_table->RemoveCallback(callback_id);
+      char* dummy_buffer;
+      callback = callback_table->RemoveCallback(callback_id, &dummy_buffer);
     }
   }
   if (callback.func == NULL)
     return;
   PP_RunCompletionCallback(&callback, result);
   rpc->result = NACL_SRPC_RESULT_OK;
 }