[Downloads] Always call DM::StartDownload() for explicit downloads.

content/browser/download/download_resource_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 CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_RESOURCE_HANDLER_H_
 #define CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_RESOURCE_HANDLER_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 79 matching lines @@
   void ResumeRequest();
 
   // May result in this object being deleted by its owner.
   void CancelRequest();
 
   std::string DebugString() const;
 
  private:
   virtual ~DownloadResourceHandler();
 
-  // Arrange for started_cb_ to be called on the UI thread with the
-  // below values, nulling out started_cb_.  Should only be called
-  // on the IO thread.
-  void CallStartedCB(DownloadItem* item,
-                     DownloadInterruptReason interrupt_reason);
+  void NotifyDownloadManagerOfSuccessfulResponseStart(
+      ResourceResponse* response);
+
+  void NotifyDownloadManagerOfFailedRequest(
+      DownloadInterruptReason interrupt_reason);
 
   uint32 download_id_;
   // This is read only on the IO thread, but may only
   // be called on the UI thread.
   DownloadUrlParameters::OnStartedCallback started_cb_;
   scoped_ptr<DownloadSaveInfo> save_info_;
 
   // Data flow
   scoped_refptr<net::IOBuffer> read_buffer_;       // From URLRequest.
   scoped_ptr<ByteStreamWriter> stream_writer_; // To rest of system.
 
   // The following are used to collect stats.
   base::TimeTicks download_start_time_;
   base::TimeTicks last_read_time_;
   base::TimeTicks last_stream_pause_time_;
   base::TimeDelta total_pause_time_;
   size_t last_buffer_size_;
   int64 bytes_read_;
 
   int pause_count_;
   bool was_deferred_;
 
   // For DCHECKing
-  bool on_response_started_called_;
+  bool download_manager_notified_;
 
   static const int kReadBufSize = 32768;  // bytes
   static const int kThrottleTimeMs = 200;  // milliseconds
 
   DISALLOW_COPY_AND_ASSIGN(DownloadResourceHandler);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_RESOURCE_HANDLER_H_