Fix the comment of PPB_MessageLoop.PostWork()

ppapi/proxy/ppapi_proxy_test.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ppapi/proxy/ppapi_proxy_test.h"
 
 #include <sstream>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 302 matching lines @@
 
   secondary_thread_.reset(new base::DelegateSimpleThread(
       this, "PluginProxyMultiThreadTest"));
 
   {
     ProxyAutoLock auto_lock;
 
     // MessageLoopResource assumes that the proxy lock has been acquired.
     secondary_thread_message_loop_ = new MessageLoopResource(pp_instance());
 
-    // TODO(yzshen): The comment of PPB_MessageLoop says that it would return
-    // PP_OK_COMPLETIONPENDING. Either fix the comment or the implementation.
     ASSERT_EQ(PP_OK,
         secondary_thread_message_loop_->PostWork(
             PP_MakeCompletionCallback(
                 &PluginProxyMultiThreadTest::InternalSetUpTestOnSecondaryThread,
                 this),
             0));
   }
 
   SetUpTestOnMainThread();
 
@@ skipping 239 matching lines @@
   plugin_thread_.message_loop_proxy()->PostTask(FROM_HERE,
       base::Bind(&RunTaskOnRemoteHarness,
                  task,
                  &task_complete));
   task_complete.Wait();
 }
 
 
 }  // namespace proxy
 }  // namespace ppapi