Ensure tests have an active task runner

chrome/browser/extensions/activity_log/uma_policy_unittest.cc

 // Copyright 2013 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/time/time.h"
 #include "chrome/browser/extensions/activity_log/activity_action_constants.h"
 #include "chrome/browser/extensions/activity_log/uma_policy.h"
 #include "chrome/test/base/testing_profile.h"
+#include "content/public/test/test_browser_thread_bundle.h"
 #include "extensions/common/dom_action_types.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace extensions {
 
 class UmaPolicyTest : public testing::Test {
  public:
   UmaPolicyTest() {
     profile_.reset(new TestingProfile());
   }
 
  protected:
+  content::TestBrowserThreadBundle thread_bundle_;
   scoped_ptr<TestingProfile> profile_;
 };
 
 TEST_F(UmaPolicyTest, Construct) {
   ActivityLogPolicy* policy = new UmaPolicy(profile_.get());
   policy->Close();
 }
 
 TEST_F(UmaPolicyTest, MatchActionToStatusTest) {
   UmaPolicy* policy = new UmaPolicy(profile_.get());
@@ skipping 185 matching lines @@
             UmaPolicy::CleanURL(GURL("http://www.cnn.com")));
   ASSERT_EQ("http://www.cnn.com/",
             UmaPolicy::CleanURL(GURL("http://www.cnn.com/#a")));
   ASSERT_EQ("http://www.cnn.com/",
             UmaPolicy::CleanURL(GURL("http://www.cnn.com/#aaaa")));
   ASSERT_EQ("http://www.cnn.com/?q=a",
             UmaPolicy::CleanURL(GURL("http://www.cnn.com/?q=a")));
 }
 
 }  // namespace extensions