Remove wstring-ness from some more locale variables.

chrome/browser/renderer_host/resource_message_filter.cc

Index: chrome/browser/renderer_host/resource_message_filter.cc
diff --git a/chrome/browser/renderer_host/resource_message_filter.cc b/chrome/browser/renderer_host/resource_message_filter.cc
index e28146b683e102c4d06e9211e1835434faf53de2..a8253e607b5d8e788da38a0ec5028ac2020866f0 100644
--- a/chrome/browser/renderer_host/resource_message_filter.cc
+++ b/chrome/browser/renderer_host/resource_message_filter.cc
@@ -723,7 +723,7 @@ void ResourceMessageFilter::OnGetPluginInfo(const GURL& url,
 
 void ResourceMessageFilter::OnOpenChannelToPlugin(const GURL& url,
                                                   const std::string& mime_type,
-                                                  const std::wstring& locale,
+                                                  const std::string& locale,
                                                   IPC::Message* reply_msg) {
   plugin_service_->OpenChannelToPlugin(
       this, url, mime_type, locale, reply_msg);