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 f6efe2eadfcb3c76f03c2d3fcd4c7b526a47e5b3..9c75dd95a891c93979e77add9db9e19f534a8876 100644
--- a/chrome/browser/net/chrome_network_delegate.h
+++ b/chrome/browser/net/chrome_network_delegate.h
@@ -28,11 +28,14 @@ class ChromeNetworkDelegate : public net::NetworkDelegate {
 
  private:
   // NetworkDelegate methods:
-  virtual bool OnBeforeURLRequest(net::URLRequest* request,
+  virtual int OnBeforeURLRequest(net::URLRequest* request,
+                                 net::CompletionCallback* callback);
+  virtual int OnBeforeSendHeaders(uint64 request_id,
+                                  net::HttpRequestHeaders* headers,
                                   net::CompletionCallback* callback);
-  virtual void OnSendHttpRequest(net::HttpRequestHeaders* headers);
   virtual void OnResponseStarted(net::URLRequest* request);
   virtual void OnReadCompleted(net::URLRequest* request, int bytes_read);
+  virtual void OnURLRequestDestroyed(net::URLRequest* request);
   virtual net::URLRequestJob* OnMaybeCreateURLRequestJob(
       net::URLRequest* request);