Revert r21117 as it caused reliability failures....

chrome/plugin/plugin_main.cc

 // Copyright (c) 2006-2008 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 "build/build_config.h"
 
 #if defined(OS_WIN)
 #include "app/win_util.h"
 #endif
 #include "base/command_line.h"
@@ skipping 11 matching lines @@
 #if defined(OS_WIN)
 #include "chrome/test/injection_test_dll.h"
 #include "sandbox/src/sandbox.h"
 #elif defined(OS_LINUX)
 #include "chrome/common/chrome_descriptors.h"
 #include "base/global_descriptors_posix.h"
 #endif
 
 // main() routine for running as the plugin process.
 int PluginMain(const MainFunctionParams& parameters) {
-  // The main thread of the plugin services UI.
-  MessageLoop main_message_loop(MessageLoop::TYPE_UI);
+  // The main thread of the plugin services IO.
+  MessageLoopForIO main_message_loop;
   std::wstring app_name = chrome::kBrowserAppName;
   PlatformThread::SetName(WideToASCII(app_name + L"_PluginMain").c_str());
 
   // Initialize the SystemMonitor
   base::SystemMonitor::Start();
 
   const CommandLine& parsed_command_line = parameters.command_line_;
 
 #if defined(OS_WIN)
   sandbox::TargetServices* target_services =
@@ skipping 29 matching lines @@
     LOG(WARNING) << "Plugin ("
     << getpid()
     << ") paused waiting for debugger to attach @ pid";
     pause();
 #else
   NOTIMPLEMENTED() << " non-windows startup, plugin startup dialog etc.";
 #endif
   }
 
   {
-    ChildProcess plugin_process;
-    plugin_process.set_main_thread(new PluginThread());
+    ChildProcess plugin_process(new PluginThread());
 #if defined(OS_WIN)
     if (!no_sandbox && target_services)
       target_services->LowerToken();
 
     if (sandbox_test_module) {
       RunRendererTests run_security_tests =
           reinterpret_cast<RunPluginTests>(GetProcAddress(sandbox_test_module,
                                                           kPluginTestCall));
       DCHECK(run_security_tests);
       if (run_security_tests) {
@@ skipping 10 matching lines @@
 
     MessageLoop::current()->Run();
   }
 
 #if defined(OS_WIN)
   CoUninitialize();
 #endif
 
   return 0;
 }