Revert 150813 - Disable WebNavigationApiTest.Failures for flakiness.

chrome/browser/extensions/api/web_navigation/web_navigation_apitest.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 <list>
 #include <set>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/utf_string_conversions.h"
@@ skipping 406 matching lines @@
   ASSERT_TRUE(
       RunExtensionSubtest("webnavigation", "test_referenceFragment.html"))
           << message_;
 }
 
 IN_PROC_BROWSER_TEST_F(WebNavigationApiTest, SimpleLoad) {
   ASSERT_TRUE(
       RunExtensionSubtest("webnavigation", "test_simpleLoad.html")) << message_;
 }
 
-//TODO(jochen): Flakily failing after http://crrev.com/150796.
-//IN_PROC_BROWSER_TEST_F(WebNavigationApiTest, Failures) {
-//  ASSERT_TRUE(
-//      RunExtensionSubtest("webnavigation", "test_failures.html")) << message_;
-//}
+IN_PROC_BROWSER_TEST_F(WebNavigationApiTest, Failures) {
+  ASSERT_TRUE(
+      RunExtensionSubtest("webnavigation", "test_failures.html")) << message_;
+}
 
 IN_PROC_BROWSER_TEST_F(WebNavigationApiTest, FilteredTest) {
   ASSERT_TRUE(
       RunExtensionSubtest("webnavigation", "test_filtered.html")) << message_;
 }
 
 IN_PROC_BROWSER_TEST_F(WebNavigationApiTest, UserAction) {
   // Wait for the extension to set itself up and return control to us.
   ASSERT_TRUE(
       RunExtensionSubtest("webnavigation", "test_userAction.html")) << message_;
@@ skipping 177 matching lines @@
       test_server()->GetURL("test6"),
       "updateHistory()",
       extension->GetResourceURL("crossProcess/empty.html"));
 
   ASSERT_TRUE(RunPageTest(
       extension->GetResourceURL("test_crossProcess.html").spec()))
           << message_;
 }
 
 }  // namespace extensions