Forcibly clear worker ref counts on shutdown.

chrome/browser/ui/views/first_run_bubble_unittest.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 "base/macros.h"
 #include "chrome/browser/search_engines/template_url_service_factory.h"
 #include "chrome/browser/ui/views/first_run_bubble.h"
 #include "chrome/test/base/testing_profile.h"
 #include "components/search_engines/template_url.h"
 #include "components/search_engines/template_url_service.h"
+#include "content/public/test/test_browser_thread.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_tree_host.h"
 #include "ui/events/event.h"
 #include "ui/events/event_processor.h"
 #include "ui/events/event_utils.h"
 #include "ui/views/test/views_test_base.h"
 #include "ui/views/view.h"
 #include "ui/views/widget/widget.h"
 
@@ skipping 38 matching lines @@
 
   // Overrides from views::ViewsTestBase:
   void SetUp() override;
 
   void CreateAndCloseBubbleOnEventTest(ui::Event* event);
 
  protected:
   TestingProfile* profile() { return &profile_; }
 
  private:
+  // TestBrowserThreadBundle cannot be used here because the ViewsTestBase
+  // superclass creates its own MessageLoop.
+  content::TestBrowserThread ui_thread_;
   TestingProfile profile_;
 
   DISALLOW_COPY_AND_ASSIGN(FirstRunBubbleTest);
 };
 
-FirstRunBubbleTest::FirstRunBubbleTest() {}
+FirstRunBubbleTest::FirstRunBubbleTest()
+    : ui_thread_(content::BrowserThread::UI, base::MessageLoop::current()) {}
 
 FirstRunBubbleTest::~FirstRunBubbleTest() {}
 
 void FirstRunBubbleTest::SetUp() {
   ViewsTestBase::SetUp();
   TemplateURLServiceFactory::GetInstance()->SetTestingFactoryAndUse(
       profile(), &TemplateURLServiceFactory::BuildInstanceFor);
   TemplateURLService* turl_model =
       TemplateURLServiceFactory::GetForProfile(profile());
   turl_model->Load();
@@ skipping 56 matching lines @@
       ui::EF_LEFT_MOUSE_BUTTON, ui::EF_LEFT_MOUSE_BUTTON);
   CreateAndCloseBubbleOnEventTest(&mouse_down);
 }
 
 TEST_F(FirstRunBubbleTest, CloseBubbleOnTouchDownEvent) {
   ui::TouchEvent touch_down(
       ui::ET_TOUCH_PRESSED, gfx::Point(10, 10), 0, ui::EventTimeForNow());
   CreateAndCloseBubbleOnEventTest(&touch_down);
 }