Add TestBrowserThreadBundle into RenderViewHostTestHarness. Kill some unnecessary real threads.

chrome/browser/extensions/active_tab_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 <string>
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
 #include "base/values.h"
@@ skipping 40 matching lines @@
           .Set("permissions", permissions))
       .SetID(id)
       .Build();
 }
 
 class ActiveTabTest : public ChromeRenderViewHostTestHarness {
  public:
   ActiveTabTest()
       : extension(CreateTestExtension("deadbeef", true)),
         another_extension(CreateTestExtension("feedbeef", true)),
-        extension_without_active_tab(CreateTestExtension("badbeef", false)),
-        ui_thread_(BrowserThread::UI, MessageLoop::current()) {}
+        extension_without_active_tab(CreateTestExtension("badbeef", false)) {}
 
  protected:
   virtual void SetUp() OVERRIDE {
     ChromeRenderViewHostTestHarness::SetUp();
     TabHelper::CreateForWebContents(web_contents());
   }
 
   int tab_id() {
     return SessionID::IdForTab(web_contents());
   }
@@ skipping 44 matching lines @@
   }
 
   // An extension with the activeTab permission.
   scoped_refptr<const Extension> extension;
 
   // Another extension with activeTab (for good measure).
   scoped_refptr<const Extension> another_extension;
 
   // An extension without the activeTab permission.
   scoped_refptr<const Extension> extension_without_active_tab;
-
- private:
-  content::TestBrowserThread ui_thread_;
 };
 
 TEST_F(ActiveTabTest, GrantToSinglePage) {
   GURL google("http://www.google.com");
   NavigateAndCommit(google);
 
   // No access unless it's been granted.
   EXPECT_TRUE(IsBlocked(extension, google));
   EXPECT_TRUE(IsBlocked(another_extension, google));
   EXPECT_TRUE(IsBlocked(extension_without_active_tab, google));
@@ skipping 180 matching lines @@
   Reload();
 
   EXPECT_FALSE(IsAllowed(extension, google, tab_id()));
   EXPECT_FALSE(IsAllowed(extension, google_h1, tab_id()));
   EXPECT_FALSE(IsAllowed(extension, chromium, tab_id()));
   EXPECT_FALSE(IsAllowed(extension, chromium_h1, tab_id()));
 }
 
 }  // namespace
 }  // namespace extensions