Finish taking out render_messages.h include from other headers.

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 "base/command_line.h"
 #include "base/message_loop.h"
+#include "base/string_util.h"
 #include "base/system_monitor.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/logging_chrome.h"
 #include "chrome/common/main_function_params.h"
 #include "chrome/common/win_util.h"
 #include "chrome/plugin/plugin_process.h"
 #include "chrome/test/injection_test_dll.h"
 #include "sandbox/src/sandbox.h"
 
@@ skipping 64 matching lines @@
     // Load the accelerator table from the browser executable and tell the
     // message loop to use it when translating messages.
     MessageLoop::current()->Run();
   }
   PluginProcess::GlobalCleanup();
 
   CoUninitialize();
   return 0;
 }