Only commit cookie changes in prerenders after a prerender is shown

chrome/browser/ui/webui/net_internals/net_internals_ui_browsertest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/webui/net_internals/net_internals_ui_browsertest.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/file_util.h"
@@ skipping 380 matching lines @@
 }
 
 void NetInternalsTest::SetUpOnMainThread() {
   WebUIBrowserTest::SetUpOnMainThread();
   // Increase the memory allowed in a prerendered page above normal settings,
   // as debug builds use more memory and often go over the usual limit.
   Profile* profile = browser()->profile();
   prerender::PrerenderManager* prerender_manager =
       prerender::PrerenderManagerFactory::GetForProfile(profile);
   prerender_manager->mutable_config().max_bytes = 1000 * 1024 * 1024;
+  if (!prerender_manager->cookie_store_loaded()) {
+    base::RunLoop loop;
+    prerender_manager->set_on_cookie_store_loaded_cb_for_testing(
+        loop.QuitClosure());
+    loop.Run();
+  }
 }
 
 content::WebUIMessageHandler* NetInternalsTest::GetMockMessageHandler() {
   return message_handler_.get();
 }
 
 GURL NetInternalsTest::CreatePrerenderLoaderUrl(
     const GURL& prerender_url) {
   EXPECT_TRUE(StartTestServer());
   std::vector<net::SpawnedTestServer::StringPair> replacement_text;
   replacement_text.push_back(
       make_pair("REPLACE_WITH_PRERENDER_URL", prerender_url.spec()));
   std::string replacement_path;
   EXPECT_TRUE(net::SpawnedTestServer::GetFilePathWithReplacements(
       "files/prerender/prerender_loader.html",
       replacement_text,
       &replacement_path));
   GURL url_loader = test_server()->GetURL(replacement_path);
   return url_loader;
 }
 
 bool NetInternalsTest::StartTestServer() {
   if (test_server_started_)
     return true;
   test_server_started_ = test_server()->Start();
   return test_server_started_;
 }