Add TestBrowserThreadBundle into RenderViewHostTestHarness. Kill some unnecessary real threads.

components/web_modal/web_contents_modal_dialog_manager_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 "components/web_modal/native_web_contents_modal_dialog_manager.h"
 #include "components/web_modal/web_contents_modal_dialog_manager.h"
-#include "content/public/test/test_browser_thread.h"
 #include "content/public/test/test_renderer_host.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using content::BrowserThread;
 
 namespace web_modal {
 
 class WebContentsModalDialogManagerTest
     : public content::RenderViewHostTestHarness {
  public:
-  WebContentsModalDialogManagerTest()
-      : ui_thread_(BrowserThread::UI, &message_loop_) {
-  }
-
   virtual void SetUp() {
     content::RenderViewHostTestHarness::SetUp();
     WebContentsModalDialogManager::CreateForWebContents(web_contents());
   }
-
- private:
-  content::TestBrowserThread ui_thread_;
 };
 
 class NativeWebContentsModalDialogManagerCloseTest
     : public NativeWebContentsModalDialogManager {
  public:
   NativeWebContentsModalDialogManagerCloseTest(
       NativeWebContentsModalDialogManagerDelegate* delegate)
       : delegate_(delegate) {}
   virtual void ManageDialog(NativeWebContentsModalDialog dialog) OVERRIDE {
   }
@@ skipping 40 matching lines @@
     // reinterpret_cast is valid.
     web_contents_modal_dialog_manager->ShowDialog(
         reinterpret_cast<NativeWebContentsModalDialog>(i));
   EXPECT_EQ(native_manager->close_count, 0);
 
   test_api.CloseAllDialogs();
   EXPECT_EQ(native_manager->close_count, kWindowCount);
 }
 
 }  // namespace web_modal