Revert "Reland: URLRequestJob: change ReadRawData contract"

chrome/browser/chromeos/fileapi/external_file_url_request_job.h

Index: chrome/browser/chromeos/fileapi/external_file_url_request_job.h
diff --git a/chrome/browser/chromeos/fileapi/external_file_url_request_job.h b/chrome/browser/chromeos/fileapi/external_file_url_request_job.h
index dff3379ba3ffc324346ccdb54e80afd0c9eacd58..a026e439b5e39b644ee45293cba0973447fbf710 100644
--- a/chrome/browser/chromeos/fileapi/external_file_url_request_job.h
+++ b/chrome/browser/chromeos/fileapi/external_file_url_request_job.h
@@ -63,17 +63,12 @@ class ExternalFileURLRequestJob : public net::URLRequestJob {
   void Kill() override;
   bool GetMimeType(std::string* mime_type) const override;
   bool IsRedirectResponse(GURL* location, int* http_status_code) override;
-  int ReadRawData(net::IOBuffer* buf, int buf_size) override;
+  bool ReadRawData(net::IOBuffer* buf, int buf_size, int* bytes_read) override;
 
  protected:
   ~ExternalFileURLRequestJob() override;
 
  private:
-  // Helper method to start the job. Should be called asynchronously because
-  // NotifyStartError() is not legal to call synchronously in
-  // URLRequestJob::Start().
-  void StartAsync();
-
   // Called from an internal helper class defined in drive_url_request_job.cc,
   // which is running on the UI thread.
   void OnHelperResultObtained(
@@ -96,7 +91,6 @@ class ExternalFileURLRequestJob : public net::URLRequestJob {
   void* const profile_id_;
 
   // The range of the file to be returned.
-  net::Error range_parse_result_;
   net::HttpByteRange byte_range_;
   int64 remaining_bytes_;