Ensure tests have an active task runner

chrome/browser/ui/omnibox/omnibox_controller_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/prefs/pref_service.h"
 #include "chrome/browser/autocomplete/autocomplete_controller.h"
 #include "chrome/browser/ui/omnibox/omnibox_controller.h"
 #include "chrome/test/base/testing_profile.h"
 #include "components/omnibox/autocomplete_provider.h"
+#include "content/public/test/test_browser_thread_bundle.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 class OmniboxControllerTest : public testing::Test {
  protected:
   OmniboxControllerTest();
   ~OmniboxControllerTest() override;
 
   void CreateController();
   void AssertProviders(int expected_providers);
 
   PrefService* GetPrefs() { return profile_.GetPrefs(); }
   const AutocompleteController::Providers& GetAutocompleteProviders() const {
     return omnibox_controller_->autocomplete_controller()->providers();
   }
 
  private:
+  content::TestBrowserThreadBundle thread_bundle_;
   TestingProfile profile_;
   scoped_ptr<OmniboxController> omnibox_controller_;
 
   DISALLOW_COPY_AND_ASSIGN(OmniboxControllerTest);
 };
 
 OmniboxControllerTest::OmniboxControllerTest() {
 }
 
 OmniboxControllerTest::~OmniboxControllerTest() {
@@ skipping 33 matching lines @@
   // Ensure we have at least one provider.
   ASSERT_NE(0, observed_providers);
 
   // Ensure instant extended includes all the provides in classic Chrome.
   int providers_with_instant_extended = observed_providers;
   // TODO(beaudoin): remove TYPE_SEARCH once it's no longer needed to pass
   // the Instant suggestion through via FinalizeInstantQuery.
   CreateController();
   AssertProviders(providers_with_instant_extended);
 }