Add TestBrowserThreadBundle into RenderViewHostTestHarness. Kill some unnecessary real threads.

chrome/browser/content_settings/tab_specific_content_settings_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/string16.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/content_settings/tab_specific_content_settings.h"
 #include "chrome/test/base/chrome_render_view_host_test_harness.h"
 #include "chrome/test/base/testing_profile.h"
 #include "content/public/test/test_browser_thread.h"
@@ skipping 20 matching lines @@
   MOCK_METHOD0(OnSiteDataAccessed, void());
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MockSiteDataObserver);
 };
 
 }  // namespace
 
 class TabSpecificContentSettingsTest : public ChromeRenderViewHostTestHarness {
  public:
-  TabSpecificContentSettingsTest()
-      : browser_thread_(BrowserThread::UI, &message_loop_) {}
-
   virtual void SetUp() OVERRIDE {
     ChromeRenderViewHostTestHarness::SetUp();
     TabSpecificContentSettings::CreateForWebContents(web_contents());
   }
-
- private:
-  content::TestBrowserThread browser_thread_;
-
-  DISALLOW_COPY_AND_ASSIGN(TabSpecificContentSettingsTest);
 };
 
 TEST_F(TabSpecificContentSettingsTest, BlockedContent) {
   TabSpecificContentSettings* content_settings =
       TabSpecificContentSettings::FromWebContents(web_contents());
   net::CookieOptions options;
 
   // Check that after initializing, nothing is blocked.
   EXPECT_FALSE(
       content_settings->IsContentBlocked(CONTENT_SETTINGS_TYPE_IMAGES));
@@ skipping 216 matching lines @@
   TabSpecificContentSettings* content_settings =
       TabSpecificContentSettings::FromWebContents(web_contents());
   ContentSettingsType type = CONTENT_SETTINGS_TYPE_MEDIASTREAM;
   content_settings->OnContentAllowed(type);
   EXPECT_TRUE(content_settings->IsContentAllowed(type));
   EXPECT_FALSE(content_settings->IsContentBlocked(type));
   content_settings->OnContentBlocked(type, std::string());
   EXPECT_TRUE(content_settings->IsContentBlocked(type));
   EXPECT_FALSE(content_settings->IsContentAllowed(type));
 }