Offload disk accesses to WorkerPool in ExtensionProtocolHandler

content/browser/histogram_internals_request_job.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 CONTENT_BROWSER_HISTOGRAM_INTERNALS_REQUEST_JOB_H_
 #define CONTENT_BROWSER_HISTOGRAM_INTERNALS_REQUEST_JOB_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "net/url_request/url_request_simple_job.h"
 
 namespace content {
 
 class HistogramInternalsRequestJob : public net::URLRequestSimpleJob {
  public:
   explicit HistogramInternalsRequestJob(net::URLRequest* request);
 
-  virtual bool GetData(std::string* mime_type,
-                       std::string* charset,
-                       std::string* data) const OVERRIDE;
+  virtual int GetData(std::string* mime_type,
+                      std::string* charset,
+                      std::string* data,
+                      const net::CompletionCallback& callback) const OVERRIDE;
 
  private:
   virtual ~HistogramInternalsRequestJob() {}
 
   // The string to select histograms which have |path_| as a substring.
   std::string path_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(HistogramInternalsRequestJob);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_HISTOGRAM_INTERNALS_REQUEST_JOB_H_