OpenFileSystem should accept not mount_type but lower filesystem type

chrome/browser/chromeos/fileapi/file_system_backend.cc

 // Copyright 2013 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/fileapi/file_system_backend.h"
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/path_service.h"
@@ skipping 91 matching lines @@
 }
 
 void FileSystemBackend::Initialize(fileapi::FileSystemContext* context) {
 }
 
 void FileSystemBackend::OpenFileSystem(
     const GURL& origin_url,
     fileapi::FileSystemType type,
     fileapi::OpenFileSystemMode mode,
     const OpenFileSystemCallback& callback) {
-  DCHECK(fileapi::IsolatedContext::IsIsolatedType(type));
+  DCHECK(CanHandleType(type));
+  // TODO(nhiroki): Avoid this hard-coded mount type to support multiple
+  // filesystems (http://crbug.com/297412).
+  fileapi::FileSystemType mount_type = fileapi::kFileSystemTypeExternal;
   // Nothing to validate for external filesystem.
-  callback.Run(GetFileSystemRootURI(origin_url, type),
-               GetFileSystemName(origin_url, type),
+  callback.Run(GetFileSystemRootURI(origin_url, mount_type),
+               GetFileSystemName(origin_url, mount_type),
                base::PLATFORM_FILE_OK);
 }
 
 fileapi::FileSystemQuotaUtil* FileSystemBackend::GetQuotaUtil() {
   // No quota support.
   return NULL;
 }
 
 bool FileSystemBackend::IsAccessAllowed(
     const fileapi::FileSystemURL& url) const {
@@ skipping 166 matching lines @@
 }
 
 bool FileSystemBackend::GetVirtualPath(
     const base::FilePath& filesystem_path,
     base::FilePath* virtual_path) {
   return mount_points_->GetVirtualPath(filesystem_path, virtual_path) ||
          system_mount_points_->GetVirtualPath(filesystem_path, virtual_path);
 }
 
 }  // namespace chromeos