(For-try) Divide recursive Copy/Move into multiple async tasks

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"
@@ skipping 161 matching lines @@
   IsolatedContext::GetInstance()->GetDraggedFileInfo(
       root.filesystem_id(), &toplevels);
   if (!recursive) {
     return make_scoped_ptr(new SetFileEnumerator(toplevels))
         .PassAs<FileSystemFileUtil::AbstractFileEnumerator>();
   }
   return make_scoped_ptr(new RecursiveSetFileEnumerator(toplevels))
       .PassAs<FileSystemFileUtil::AbstractFileEnumerator>();
 }
 
-bool DraggedFileUtil::IsDirectoryEmpty(
-    FileSystemOperationContext* context,
-    const FileSystemURL& url) {
-  DCHECK(url.is_valid());
-  if (url.path().empty()) {
-    // The root directory case.
-    std::vector<FileInfo> toplevels;
-    bool success = IsolatedContext::GetInstance()->GetDraggedFileInfo(
-        url.filesystem_id(), &toplevels);
-    DCHECK(success);
-    return toplevels.empty();
-  }
-  return NativeFileUtil::IsDirectoryEmpty(url.path());
-}
-
 }  // namespace fileapi