Remove WorkerPool dependency from URLRequestFileJob.

net/url_request/file_protocol_handler.h

 // 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.
 
 #ifndef NET_URL_REQUEST_FILE_PROTOCOL_HANDLER_H_
 #define NET_URL_REQUEST_FILE_PROTOCOL_HANDLER_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
+#include "base/memory/ref_counted.h"
 #include "net/url_request/url_request_job_factory.h"
 
 class GURL;
 
+namespace base {
+class TaskRunner;
+}
+
 namespace net {
 
 class NetworkDelegate;
 class URLRequestJob;
 
 // Implements a ProtocolHandler for File jobs. If |network_delegate_| is NULL,
 // then all file requests will fail with ERR_ACCESS_DENIED.
 class NET_EXPORT FileProtocolHandler :
     public URLRequestJobFactory::ProtocolHandler {
  public:
-  FileProtocolHandler();
+  explicit FileProtocolHandler(
+      const scoped_refptr<base::TaskRunner>& file_task_runner);
+  virtual ~FileProtocolHandler();
   virtual URLRequestJob* MaybeCreateJob(
       URLRequest* request, NetworkDelegate* network_delegate) const OVERRIDE;
   virtual bool IsSafeRedirectTarget(const GURL& location) const OVERRIDE;
 
  private:
+  const scoped_refptr<base::TaskRunner> file_task_runner_;
   DISALLOW_COPY_AND_ASSIGN(FileProtocolHandler);
 };
 
 }  // namespace net
 
 #endif  // NET_URL_REQUEST_FILE_PROTOCOL_HANDLER_H_