Revert r21117 as it caused reliability failures....

chrome/renderer/renderer_main.cc

Index: chrome/renderer/renderer_main.cc
===================================================================
--- chrome/renderer/renderer_main.cc	(revision 21215)
+++ chrome/renderer/renderer_main.cc	(working copy)
@@ -22,7 +22,6 @@
 #include "chrome/common/main_function_params.h"
 #include "chrome/renderer/renderer_main_platform_delegate.h"
 #include "chrome/renderer/render_process.h"
-#include "chrome/renderer/render_thread.h"
 #include "grit/chromium_strings.h"
 #include "grit/generated_resources.h"
 
@@ -85,11 +84,8 @@
   StatsScope<StatsCounterTimer>
       startup_timer(chrome::Counters::renderer_main());
 
-  // The main message loop of the renderer services doesn't have IO or UI tasks,
-  // unless in-process-plugins is used.
-  MessageLoop main_message_loop(RenderProcess::InProcessPlugins() ?
-              MessageLoop::TYPE_UI : MessageLoop::TYPE_DEFAULT);
-
+  // The main thread of the renderer services IO.
+  MessageLoopForIO main_message_loop;
   std::wstring app_name = chrome::kBrowserAppName;
   PlatformThread::SetName(WideToASCII(app_name + L"_RendererMain").c_str());
 
@@ -120,7 +116,6 @@
 
   {
     RenderProcess render_process;
-    render_process.set_main_thread(new RenderThread());
     bool run_loop = true;
     if (!no_sandbox) {
       run_loop = platform.EnableSandbox();