GData save package support with MHTML.

chrome/browser/download/save_package_file_picker.h

Index: chrome/browser/download/save_package_file_picker.h
===================================================================
--- chrome/browser/download/save_package_file_picker.h	(revision 128956)
+++ chrome/browser/download/save_package_file_picker.h	(working copy)
@@ -1,4 +1,4 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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.
 
@@ -28,7 +28,7 @@
   // web page.  This is available for testing.
   static void SetShouldPromptUser(bool should_prompt);
 
- private:
+ protected:

[Randy Smith (Not in Mondays), 2012/03/26 21:08:33]

We didn't talk about this on VC, but (given Zel's request that we just make
ChromeOS always save MHTML) would doing the interface + 2 impls and getting rid
of the private->protected change make sense?  I don't think you're going to need
to do pass-through semantics on ChromeOs anymore.

[achuithb, 2012/03/26 21:35:54]

That's true, so I'll take a look at doing this next.

   // SelectFileDialog::Listener implementation.
   virtual void FileSelected(const FilePath& path,
                             int index,