Simplify threading in browser thread by making only ChromeThread deal with di...

chrome/browser/chrome_plugin_host.cc

Index: chrome/browser/chrome_plugin_host.cc
===================================================================
--- chrome/browser/chrome_plugin_host.cc	(revision 30037)
+++ chrome/browser/chrome_plugin_host.cc	(working copy)
@@ -735,13 +735,10 @@
 CPError STDCALL CPB_PluginThreadAsyncCall(CPID id,
                                           void (*func)(void *),
                                           void *user_data) {
-  MessageLoop *message_loop = ChromeThread::GetMessageLoop(ChromeThread::IO);
-  if (!message_loop) {
-    return CPERR_FAILURE;
-  }
-  message_loop->PostTask(FROM_HERE, NewRunnableFunction(func, user_data));
-
-  return CPERR_SUCCESS;
+  bool posted = ChromeThread::PostTask(
+      ChromeThread::IO, FROM_HERE,
+      NewRunnableFunction(func, user_data));
+  return posted ? CPERR_SUCCESS : CPERR_FAILURE;
 }
 
 CPError STDCALL CPB_OpenFileDialog(CPID id,