Automated IWYU fix for TaskRunner includes.

content/public/test/test_browser_context.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 "content/public/test/test_browser_context.h"
 
 #include <utility>
 
 #include "base/files/file_path.h"
+#include "base/single_thread_task_runner.h"
 #include "base/test/null_task_runner.h"
 #include "content/public/browser/permission_manager.h"
 #include "content/public/test/mock_resource_context.h"
 #include "content/test/mock_background_sync_controller.h"
 #include "content/test/mock_ssl_host_state_delegate.h"
 #include "net/url_request/url_request_context.h"
 #include "net/url_request/url_request_context_getter.h"
 #include "net/url_request/url_request_test_util.h"
 #include "storage/browser/quota/special_storage_policy.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 127 matching lines @@
 }
 
 net::URLRequestContextGetter*
 TestBrowserContext::CreateMediaRequestContextForStoragePartition(
     const base::FilePath& partition_path,
     bool in_memory) {
   return NULL;
 }
 
 }  // namespace content