Don't use base::WorkerPool in the asset_bundle app.

services/asset_bundle/asset_bundle_impl.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 "services/asset_bundle/asset_bundle_impl.h"
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/logging.h"
-#include "base/threading/worker_pool.h"
 #include "mojo/common/data_pipe_utils.h"
 
 namespace mojo {
 namespace asset_bundle {
 namespace {
 
 void Ignored(bool) {
 }
 
 }  // namespace
 
 AssetBundleImpl::AssetBundleImpl(InterfaceRequest<AssetBundle> request,
-                                 scoped_ptr<base::ScopedTempDir> asset_dir)
-    : binding_(this, request.Pass()), asset_dir_(asset_dir.Pass()) {
+                                 scoped_ptr<base::ScopedTempDir> asset_dir,
+                                 scoped_refptr<base::TaskRunner> worker_runner)
+    : binding_(this, request.Pass()),
+      asset_dir_(asset_dir.Pass()),
+      worker_runner_(worker_runner.Pass()) {
 }
 
 AssetBundleImpl::~AssetBundleImpl() {
 }
 
 void AssetBundleImpl::GetAsStream(
     const String& asset_name,
     const Callback<void(ScopedDataPipeConsumerHandle)>& callback) {
   DataPipe pipe;
   callback.Run(pipe.consumer_handle.Pass());
 
   std::string asset_string = asset_name.To<std::string>();
   base::FilePath asset_path =
       base::MakeAbsoluteFilePath(asset_dir_->path().Append(asset_string));
 
   if (!asset_dir_->path().IsParent(asset_path)) {
     LOG(WARNING) << "Requested asset '" << asset_string << "' does not exist.";
     return;
   }
 
-  scoped_refptr<base::TaskRunner> worker =
-      base::WorkerPool::GetTaskRunner(true);
-  common::CopyFromFile(asset_path, pipe.producer_handle.Pass(), 0, worker.get(),
-                       base::Bind(&Ignored));
+  common::CopyFromFile(asset_path, pipe.producer_handle.Pass(), 0,
+                       worker_runner_.get(), base::Bind(&Ignored));
 }
 
 }  // namespace asset_bundle
 }  // namespace mojo