Adds the new URLRequest::OnBeforeNetworkStart hook to the

content/browser/loader/resource_loader.cc

Index: content/browser/loader/resource_loader.cc
diff --git a/content/browser/loader/resource_loader.cc b/content/browser/loader/resource_loader.cc
index cb4696600eeb475be8b21f0d560ffe952ec15d05..9e8b91fd764a9ecda985a98fb2d8cfc8d7574b06 100644
--- a/content/browser/loader/resource_loader.cc
+++ b/content/browser/loader/resource_loader.cc
@@ -289,6 +289,20 @@ void ResourceLoader::OnSSLCertificateError(net::URLRequest* request,
       fatal);
 }
 
+void ResourceLoader::OnBeforeNetworkStart(net::URLRequest* unused,
+                                          bool* defer) {
+  DCHECK_EQ(request_.get(), unused);
+
+  // Give the handler a chance to delay the URLRequest from using the network.
+  if (!handler_->OnBeforeNetworkStart(
+           GetRequestInfo()->GetRequestID(), request_->url(), defer)) {
+    Cancel();
+    return;
+  } else if (*defer) {
+    deferred_stage_ = DEFERRED_NETWORK_START;
+  }
+}
+
 void ResourceLoader::OnResponseStarted(net::URLRequest* unused) {
   DCHECK_EQ(request_.get(), unused);
 
@@ -391,6 +405,9 @@ void ResourceLoader::Resume() {
     case DEFERRED_START:
       StartRequestInternal();
       break;
+    case DEFERRED_NETWORK_START:
+      request_->ResumeNetworkStart();
+      break;
     case DEFERRED_REDIRECT:
       request_->FollowDeferredRedirect();
       break;