Remove the is_loading_ field from WebContentsImpl

chrome/browser/task_management/providers/web_contents/subframe_task_browsertest.cc

 // Copyright 2015 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 "base/macros.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/task_management/task_management_browsertest_util.h"
 #include "chrome/grit/generated_resources.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "chrome/test/base/ui_test_utils.h"
@@ skipping 99 matching lines @@
                                  base::CompareCase::INSENSITIVE_ASCII));
 
     // All tasks must be running on different processes.
     EXPECT_NE(subframe_task_1->process_id(), subframe_task_2->process_id());
     EXPECT_NE(subframe_task_1->process_id(), cross_site_task->process_id());
     EXPECT_NE(subframe_task_2->process_id(), cross_site_task->process_id());
   }
 
   // If we navigate to the simple page on a.com which doesn't have cross-site
   // iframes, we expect not to have any SubframeTasks.
-  NavigateTo(kSimplePageUrl);
+  ui_test_utils::NavigateToURLBlockUntilNavigationsComplete(
+      browser(), embedded_test_server()->GetURL(kSimplePageUrl), 2);
 
   ASSERT_EQ(1U, task_manager.tasks().size());
   const Task* simple_page_task = task_manager.tasks().front();
   EXPECT_EQ(Task::RENDERER, simple_page_task->GetType());
   EXPECT_EQ(PrefixExpectedTabTitle("Title Of Awesomeness"),
             simple_page_task->title());
 }
 
 }  // namespace task_management