Don't create parallel request until download file is initialized

content/browser/download/download_item_impl.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_DOWNLOAD_DOWNLOAD_ITEM_IMPL_H_
 #define CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_ITEM_IMPL_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 390 matching lines @@
   // These are listed in approximately chronological order.  There are also
   // public methods involved in normal download progression; see
   // the implementation ordering in download_item_impl.cc.
 
   // Construction common to all constructors. |active| should be true for new
   // downloads and false for downloads from the history.
   // |download_type| indicates to the net log system what kind of download
   // this is.
   void Init(bool active, DownloadType download_type);
 
-  // Start a series of events that result in the file being downloaded.
-  void StartDownload();
-
   // Callback from file thread when we initialize the DownloadFile.
   void OnDownloadFileInitialized(DownloadInterruptReason result);
 
   // Called to determine the target path. Will cause OnDownloadTargetDetermined
   // to be called when the target information is available.
   void DetermineDownloadTarget();
 
   // Called when the target path has been determined. |target_path| is the
   // suggested target path. |disposition| indicates how the target path should
   // be used (see TargetDisposition). |danger_type| is the danger level of
@@ skipping 76 matching lines @@
   void AutoResumeIfValid();
 
   enum class ResumptionRequestSource { AUTOMATIC, USER };
   void ResumeInterruptedDownload(ResumptionRequestSource source);
 
   // Update origin information based on the response to a download resumption
   // request. Should only be called if the resumption request was successful.
   virtual void UpdateValidatorsOnResumption(
       const DownloadCreateInfo& new_create_info);
 
-  // Cancel a particular request that starts from |offset|.
-  void CancelRequestWithOffset(int64_t offset);
-
   static DownloadState InternalToExternalState(
       DownloadInternalState internal_state);
   static DownloadInternalState ExternalToInternalState(
       DownloadState external_state);
 
   // Debugging routines --------------------------------------------------------
   static const char* DebugDownloadStateString(DownloadInternalState state);
   static const char* DebugResumeModeString(ResumeMode mode);
   static bool IsValidSavePackageStateTransition(DownloadInternalState from,
                                                 DownloadInternalState to);
@@ skipping 195 matching lines @@
   int64_t received_bytes_at_length_mismatch = -1;
 
   base::WeakPtrFactory<DownloadItemImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadItemImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_ITEM_IMPL_H_