Extract external file systems handling from isolated context.

webkit/fileapi/isolated_file_util.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 "webkit/fileapi/isolated_file_util.h"
 
 #include <string>
 #include <vector>
 
 #include "webkit/blob/shareable_file_reference.h"
 #include "webkit/fileapi/file_system_context.h"
 #include "webkit/fileapi/file_system_operation_context.h"
 #include "webkit/fileapi/file_system_url.h"
 #include "webkit/fileapi/isolated_context.h"
 #include "webkit/fileapi/native_file_util.h"
 
 using base::PlatformFileError;
 using base::PlatformFileInfo;
 
 namespace fileapi {
 
-typedef IsolatedContext::FileInfo FileInfo;
+typedef IsolatedContext::MountPointInfo FileInfo;
 
 namespace {
 
 // Simply enumerate each path from a given fileinfo set.
 // Used to enumerate top-level paths of an isolated filesystem.
 class SetFileEnumerator : public FileSystemFileUtil::AbstractFileEnumerator {
  public:
   explicit SetFileEnumerator(const std::vector<FileInfo>& files)
       : files_(files) {
     file_iter_ = files_.begin();
@@ skipping 155 matching lines @@
     std::vector<FileInfo> toplevels;
     bool success = IsolatedContext::GetInstance()->GetDraggedFileInfo(
         url.filesystem_id(), &toplevels);
     DCHECK(success);
     return toplevels.empty();
   }
   return NativeFileUtil::IsDirectoryEmpty(url.path());
 }
 
 }  // namespace