GData save package support with MHTML.

content/browser/download/save_package.cc

 // 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.
 
 #include "content/browser/download/save_package.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/file_path.h"
@@ skipping 1255 matching lines @@
   // The TabContents which owns this SavePackage may have disappeared during
   // the UI->FILE->UI thread hop of
   // GetSaveInfo->CreateDirectoryOnFileThread->ContinueGetSaveInfo.
   if (!web_contents())
     return;
 
   FilePath::StringType default_extension;
   if (can_save_as_complete)
     default_extension = kDefaultHtmlExtension;
 
+  // On ChromeOS, OnPathPicked is not invoked; SavePackageFilePickerChromeOS
+  // handles the the save.
   download_manager_->delegate()->ChooseSavePath(
       web_contents(), suggested_path, default_extension, can_save_as_complete,
       base::Bind(&SavePackage::OnPathPicked, AsWeakPtr()));
 }
 
 void SavePackage::OnPathPicked(const FilePath& final_name,
                                content::SavePageType type) {
   // Ensure the filename is safe.
   saved_main_file_path_ = final_name;
   // TODO(asanka): This call may block on IO and shouldn't be made
@@ skipping 32 matching lines @@
     StopObservation();
 }
 
 void SavePackage::FinalizeDownloadEntry() {
   DCHECK(download_);
   DCHECK(download_manager_);
 
   download_manager_->SavePageDownloadFinished(download_);
   StopObservation();
 }