Change DownloadProcessHandle to be more of an encapsulated class.

chrome/browser/download/download_item.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_item.h"
 
 #include "base/basictypes.h"
 #include "base/file_util.h"
 #include "base/format_macros.h"
 #include "base/i18n/case_conversion.h"
@@ skipping 440 matching lines @@
 void DownloadItem::Rename(const FilePath& full_path) {
   VLOG(20) << __FUNCTION__ << "()"
            << " full_path = \"" << full_path.value() << "\""
            << " " << DebugString(true);
   DCHECK(!full_path.empty());
   full_path_ = full_path;
 }
 
 void DownloadItem::TogglePause() {
   DCHECK(IsInProgress());
-  download_manager_->PauseDownload(download_id_, !is_paused_);
+  process_handle_.PauseRequest(!is_paused_);
   is_paused_ = !is_paused_;
   UpdateObservers();
 }
 
 void DownloadItem::OnDownloadCompleting(DownloadFileManager* file_manager) {
   VLOG(20) << __FUNCTION__ << "()"
            << " needs rename = " << NeedsRename()
            << " " << DebugString(true);
   DCHECK_NE(DANGEROUS, safety_state());
   DCHECK(file_manager);
@@ skipping 198 matching lines @@
         state_info_.target_name.value().c_str(),
         full_path().value().c_str());
   } else {
     description += base::StringPrintf(" url = \"%s\"", url_list.c_str());
   }
 
   description += " }";
 
   return description;
 }