Replace sets with vectors when storing file handlers.

chrome/browser/chromeos/extensions/file_manager/file_browser_handler.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/chromeos/extensions/file_manager/file_browser_handler.h"
 
 #include "base/logging.h"
 #include "base/string_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/utf_string_conversions.h"
@@ skipping 164 matching lines @@
         return NULL;
       }
     }
   }
   if (!result->ValidateFileAccessPermissions()) {
     *error = ASCIIToUTF16(errors::kInvalidFileAccessList);
     return NULL;
   }
 
   // Initialize file filters (mandatory, unless "create" access is specified,
-  // in which case is ignored).
+  // in which case is ignored). The list can be empty.
   if (!result->HasCreateAccessPermission()) {
     const ListValue* file_filters = NULL;
     if (!file_browser_handler->HasKey(keys::kFileFilters) ||
-        !file_browser_handler->GetList(keys::kFileFilters, &file_filters) ||
-        file_filters->empty()) {
+        !file_browser_handler->GetList(keys::kFileFilters, &file_filters)) {
       *error = ASCIIToUTF16(errors::kInvalidFileFiltersList);
       return NULL;
     }
     for (size_t i = 0; i < file_filters->GetSize(); ++i) {
       std::string filter;
       if (!file_filters->GetString(i, &filter)) {
         *error = extensions::ErrorUtils::FormatErrorMessageUTF16(
             errors::kInvalidFileFilterValue, base::IntToString(i));
         return NULL;
       }
@@ skipping 83 matching lines @@
     return false;  // Failed to parse file browser actions definition.
   }
 
   extension->SetManifestData(keys::kFileBrowserHandlers, info.release());
   return true;
 }
 
 const std::vector<std::string> FileBrowserHandlerParser::Keys() const {
   return SingleKey(keys::kFileBrowserHandlers);
 }