Automated IWYU fix for TaskRunner includes.

content/browser/cache_storage/cache_storage_blob_to_disk_cache_unittest.cc

 // Copyright 2015 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/browser/cache_storage/cache_storage_blob_to_disk_cache.h"
 
 #include <string>
 #include <utility>
 
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/run_loop.h"
+#include "base/single_thread_task_runner.h"
 #include "base/test/null_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "content/browser/blob_storage/chrome_blob_storage_context.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/storage_partition.h"
 #include "content/public/test/test_browser_context.h"
 #include "content/public/test/test_browser_thread_bundle.h"
 #include "net/disk_cache/disk_cache.h"
 #include "net/url_request/url_request.h"
@@ skipping 244 matching lines @@
 }
 
 TEST_F(CacheStorageBlobToDiskCacheTest, StreamWithNullContextRequest) {
   url_request_context_getter_ = new NullURLRequestContextGetter();
   EXPECT_FALSE(Stream());
 }
 
 }  // namespace
 
 }  // namespace content