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

sky/shell/ui/internals.cc

 // Copyright 2014 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 "sky/shell/ui/internals.h"
 
+#include "base/threading/worker_pool.h"
 #include "mojo/public/cpp/application/connect.h"
 #include "mojo/public/cpp/bindings/array.h"
 #include "services/asset_bundle/asset_unpacker_impl.h"
 #include "sky/engine/tonic/dart_builtin.h"
 #include "sky/engine/tonic/dart_converter.h"
 #include "sky/engine/tonic/dart_error.h"
 #include "sky/engine/tonic/dart_state.h"
 
 using namespace blink;
 
@@ skipping 83 matching lines @@
       platform_service_provider_.get());
   service_provider_impl_.AddService<mojo::asset_bundle::AssetUnpacker>(this);
 }
 
 Internals::~Internals() {
 }
 
 void Internals::Create(
     mojo::ApplicationConnection* connection,
     mojo::InterfaceRequest<mojo::asset_bundle::AssetUnpacker> request) {
-  new mojo::asset_bundle::AssetUnpackerImpl(request.Pass());
+  new mojo::asset_bundle::AssetUnpackerImpl(
+      request.Pass(), base::WorkerPool::GetTaskRunner(true));
 }
 
 mojo::Handle Internals::TakeServicesProvidedByEmbedder() {
   return service_provider_.PassInterface().PassHandle().release();
 }
 
 }  // namespace shell
 }  // namespace sky