Fix valgrind-reported leak by creating an IO thread.

chrome/browser/policy/user_policy_signin_service_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/message_loop.h"
 #include "base/run_loop.h"
 #include "chrome/browser/policy/browser_policy_connector.h"
 #include "chrome/browser/policy/mock_cloud_policy_store.h"
 #include "chrome/browser/policy/user_cloud_policy_manager.h"
 #include "chrome/browser/policy/user_policy_signin_service.h"
@@ skipping 20 matching lines @@
 
 namespace policy {
 
 namespace {
 
 class UserPolicySigninServiceTest : public testing::Test {
  public:
   UserPolicySigninServiceTest()
       : loop_(MessageLoop::TYPE_UI),
         ui_thread_(content::BrowserThread::UI, &loop_),
-        file_thread_(content::BrowserThread::FILE, &loop_) {}
+        file_thread_(content::BrowserThread::FILE, &loop_),
+        io_thread_(content::BrowserThread::IO, &loop_) {}
 
   virtual void SetUp() OVERRIDE {
     g_browser_process->browser_policy_connector()->Init();
 
     local_state_.reset(new TestingPrefService);
     chrome::RegisterLocalState(local_state_.get());
     static_cast<TestingBrowserProcess*>(g_browser_process)->SetLocalState(
         local_state_.get());
 
     // Create a UserCloudPolicyManager with a MockCloudPolicyStore, and build a
@@ skipping 25 matching lines @@
     testing_browser_process->SetBrowserPolicyConnector(NULL);
     base::RunLoop run_loop;
     run_loop.RunUntilIdle();
   }
 
   scoped_ptr<TestingProfile> profile_;
   // Weak pointer to a MockCloudPolicyStore - lifetime is managed by the
   // UserCloudPolicyManager.
   MockCloudPolicyStore* mock_store_;
 
-  // BrowserPolicyConnector wants to initialize various components
-  // asynchronously via tasks, so create a fake thread here.
+  // BrowserPolicyConnector and UrlFetcherFactory want to initialize and free
+  // various components asynchronously via tasks, so create fake threads here.
   MessageLoop loop_;
   content::TestBrowserThread ui_thread_;
   content::TestBrowserThread file_thread_;
+  content::TestBrowserThread io_thread_;
 
   scoped_ptr<TestingPrefService> local_state_;
 };
 
 TEST_F(UserPolicySigninServiceTest, InitWhileSignedOut) {
   // Make sure user is not signed in.
   ASSERT_TRUE(SigninManagerFactory::GetForProfile(profile_.get())->
          GetAuthenticatedUsername().empty());
 
   // Let the SigninService know that the profile has been created.
@@ skipping 60 matching lines @@
   // Now sign out.
   SigninManagerFactory::GetForProfile(profile_.get())->SignOut();
 
   // UserCloudPolicyManager should be shut down.
   ASSERT_FALSE(profile_->GetUserCloudPolicyManager()->cloud_policy_service());
 }
 
 }  // namespace
 
 }  // namespace policy