Add TestBrowserThreadBundle into RenderViewHostTestHarness. Kill some unnecessary real threads.

content/browser/devtools/devtools_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 "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time.h"
 #include "content/browser/devtools/devtools_manager_impl.h"
 #include "content/browser/devtools/render_view_devtools_agent_host.h"
 #include "content/browser/renderer_host/test_render_view_host.h"
@@ skipping 88 matching lines @@
     return true;
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DevToolsManagerTestBrowserClient);
 };
 
 }  // namespace
 
 class DevToolsManagerTest : public RenderViewHostImplTestHarness {
- public:
-  DevToolsManagerTest() {
-  }
-
  protected:
   virtual void SetUp() OVERRIDE {
     original_browser_client_ = SetBrowserClientForTesting(&browser_client_);
 
     RenderViewHostImplTestHarness::SetUp();
     TestDevToolsClientHost::ResetCounters();
   }
 
   virtual void TearDown() OVERRIDE {
     RenderViewHostImplTestHarness::TearDown();
@@ skipping 163 matching lines @@
   manager->RegisterDevToolsClientHostFor(agent_host.get(), &client_host);
 
   manager->DispatchOnInspectorBackend(&client_host, "message1");
   manager->DispatchOnInspectorBackend(&client_host, "message2");
   manager->DispatchOnInspectorBackend(&client_host, "message2");
 
   client_host.Close(manager);
 }
 
 }  // namespace content