Change DownloadProcessHandle to be more of an encapsulated class.

chrome/browser/download/download_create_info.cc

 // Copyright (c) 2011 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.
 
 #include "chrome/browser/download/download_create_info.h"
 
 #include <string>
 
 #include "base/format_macros.h"
 #include "base/stringprintf.h"
@@ skipping 35 matching lines @@
 DownloadCreateInfo::~DownloadCreateInfo() {
 }
 
 std::string DownloadCreateInfo::DebugString() const {
   return base::StringPrintf("{"
                             " download_id = %d"
                             " url = \"%s\""
                             " path = \"%" PRFilePath "\""
                             " received_bytes = %" PRId64
                             " total_bytes = %" PRId64
-                            " child_id = %d"
-                            " render_view_id = %d"
-                            " request_id = %d"
+                            " request_handle = %s"
                             " prompt_user_for_save_location = %c"
                             " }",
                             download_id,
                             url().spec().c_str(),
                             path.value().c_str(),
                             received_bytes,
                             total_bytes,
-                            process_handle.child_id(),
-                            process_handle.render_view_id(),
-                            process_handle.request_id(),
+                            request_handle.DebugString().c_str(),
                             prompt_user_for_save_location ? 'T' : 'F');
 }
 
 const GURL& DownloadCreateInfo::url() const {
   return url_chain.empty() ? GURL::EmptyGURL() : url_chain.back();
 }