Adds the new URLRequest::OnBeforeNetworkStart hook to the

content/browser/loader/sync_resource_handler.cc

Index: content/browser/loader/sync_resource_handler.cc
diff --git a/content/browser/loader/sync_resource_handler.cc b/content/browser/loader/sync_resource_handler.cc
index 1310d0f36691e2d383e292d3ac08f7c114017b4c..23e44f75197c62eff297becef91f932233971202 100644
--- a/content/browser/loader/sync_resource_handler.cc
+++ b/content/browser/loader/sync_resource_handler.cc
@@ -101,6 +101,12 @@ bool SyncResourceHandler::OnWillStart(int request_id,
   return true;
 }
 
+bool SyncResourceHandler::OnBeforeNetworkStart(int request_id,
+                                               const GURL& url,
+                                               bool* defer) {
+  return true;
+}
+
 bool SyncResourceHandler::OnWillRead(int request_id,
                                      scoped_refptr<net::IOBuffer>* buf,
                                      int* buf_size,