Open NaCl IRT file only once at startup

chrome/browser/renderer_host/chrome_render_message_filter.cc

Index: chrome/browser/renderer_host/chrome_render_message_filter.cc
diff --git a/chrome/browser/renderer_host/chrome_render_message_filter.cc b/chrome/browser/renderer_host/chrome_render_message_filter.cc
index 6e8f263a9dc2744896ecf88c91b48b2eb3e35b68..c373af10b30b24043a4ccc92f76078e367fec4fc 100644
--- a/chrome/browser/renderer_host/chrome_render_message_filter.cc
+++ b/chrome/browser/renderer_host/chrome_render_message_filter.cc
@@ -200,9 +200,9 @@ void ChromeRenderMessageFilter::OverrideThreadForMessage(
 }
 
 void ChromeRenderMessageFilter::OnLaunchNaCl(
-    const std::wstring& url, int channel_descriptor, IPC::Message* reply_msg) {
+    const std::wstring& url, int socket_count, IPC::Message* reply_msg) {
   NaClProcessHost* host = new NaClProcessHost(url);
-  host->Launch(this, channel_descriptor, reply_msg);
+  host->Launch(this, socket_count, reply_msg);
 }
 
 void ChromeRenderMessageFilter::OnDnsPrefetch(