Add TestBrowserThreadBundle into RenderViewHostTestHarness. Kill some unnecessary real threads.

content/browser/web_contents/web_contents_impl_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/logging.h"
 #include "base/utf_string_conversions.h"
 #include "content/browser/renderer_host/frame_tree_node.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/browser/renderer_host/test_render_view_host.h"
 #include "content/browser/site_instance_impl.h"
@@ skipping 218 matching lines @@
     DCHECK(interstitial_page_ == interstitial);
     interstitial_page_ = NULL;
   }
 
  private:
   TestInterstitialPage* interstitial_page_;
 };
 
 class WebContentsImplTest : public RenderViewHostImplTestHarness {
  public:
-  WebContentsImplTest()
-      : ui_thread_(BrowserThread::UI, &message_loop_),
-        file_user_blocking_thread_(
-            BrowserThread::FILE_USER_BLOCKING, &message_loop_),
-        io_thread_(BrowserThread::IO, &message_loop_) {
-  }
-
   virtual void SetUp() {
     RenderViewHostImplTestHarness::SetUp();
     WebUIControllerFactory::RegisterFactory(&factory_);
   }
 
   virtual void TearDown() {
+    WebUIControllerFactory::UnregisterFactoryForTesting(&factory_);
     RenderViewHostImplTestHarness::TearDown();
-    WebUIControllerFactory::UnregisterFactoryForTesting(&factory_);
   }
 
  private:
   WebContentsImplTestWebUIControllerFactory factory_;
-  TestBrowserThread ui_thread_;
-  TestBrowserThread file_user_blocking_thread_;
-  TestBrowserThread io_thread_;
 };
 
 class TestWebContentsObserver : public WebContentsObserver {
  public:
   TestWebContentsObserver(WebContents* contents)
       : WebContentsObserver(contents) {
   }
   virtual ~TestWebContentsObserver() {}
 
   virtual void DidFinishLoad(int64 frame_id,
@@ skipping 1851 matching lines @@
   EXPECT_EQ(0UL, deep_tree->child_at(0)->child_at(0)->child_count());
 
   contents()->OnFrameDetached(16, 265);
   EXPECT_EQ(4UL, root->child_at(2)->child_count());
 
   contents()->OnFrameDetached(5, 15);
   EXPECT_EQ(2UL, root->child_count());
 }
 
 }  // namespace content