Add request_id to HttpRequestInfo and pass it to the NetworkDelegate for events.

chrome/browser/net/chrome_network_delegate.h

Index: chrome/browser/net/chrome_network_delegate.h
diff --git a/chrome/browser/net/chrome_network_delegate.h b/chrome/browser/net/chrome_network_delegate.h
index a6002ffe523ce30f49b5f5de670d9133774e09bd..dd72b757d0adb0ef87b11b8595ad62a3541306a9 100644
--- a/chrome/browser/net/chrome_network_delegate.h
+++ b/chrome/browser/net/chrome_network_delegate.h
@@ -30,7 +30,9 @@ class ChromeNetworkDelegate : public net::NetworkDelegate {
   // NetworkDelegate methods:
   virtual bool OnBeforeURLRequest(net::URLRequest* request,
                                   net::CompletionCallback* callback);
-  virtual void OnSendHttpRequest(net::HttpRequestHeaders* headers);
+  virtual bool OnBeforeSendHeaders(uint64 request_id,
+                                   net::HttpRequestHeaders* headers,
+                                   net::CompletionCallback* callback);
   virtual void OnResponseStarted(net::URLRequest* request);
   virtual void OnReadCompleted(net::URLRequest* request, int bytes_read);
   virtual net::URLRequestJob* OnMaybeCreateURLRequestJob(