Always include base extension type in Mac select file dialog

chrome/browser/extensions/api/file_system/file_system_api.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 "chrome/browser/extensions/api/file_system/file_system_api.h"
 
 #include "base/bind.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/logging.h"
@@ skipping 174 matching lines @@
 
 // Expand the mime-types and extensions provided in an AcceptOption, returning
 // them within the passed extension vector. Returns false if no valid types
 // were found.
 bool GetFileTypesFromAcceptOption(
     const file_system::AcceptOption& accept_option,
     std::vector<FilePath::StringType>* extensions,
     string16* description) {
   std::set<FilePath::StringType> extension_set;
   int description_id = 0;
-  bool valid_type = false;
 
   if (accept_option.mime_types.get()) {
     std::vector<std::string>* list = accept_option.mime_types.get();
+    bool valid_type = false;
     for (std::vector<std::string>::const_iterator iter = list->begin();
          iter != list->end(); ++iter) {
       std::vector<FilePath::StringType> inner;
       std::string accept_type = *iter;
       StringToLowerASCII(&accept_type);
-      net::GetExtensionsForMimeType(*iter, &inner);
+      net::GetExtensionsForMimeType(accept_type, &inner);
       if (inner.empty())
         continue;
 
       if (valid_type)
         description_id = 0; // We already have an accept type with label; if
                             // we find another, give up and use the default.
       else if (accept_type == "image/*")
         description_id = IDS_IMAGE_FILES;
       else if (accept_type == "audio/*")
         description_id = IDS_AUDIO_FILES;
@@ skipping 377 matching lines @@
 
   if (entry_type == WRITABLE && !HasFileSystemWritePermission()) {
     error_ = kRequiresFileSystemWriteError;
     return false;
   }
 
   return ShowPicker(suggested_name, file_type_info, picker_type, entry_type);
 }
 
 }  // namespace extensions