Cleanup file permission check code in FileAPIMessageFilter

webkit/chromeos/fileapi/cros_mount_point_provider.cc

Index: webkit/chromeos/fileapi/cros_mount_point_provider.cc
diff --git a/webkit/chromeos/fileapi/cros_mount_point_provider.cc b/webkit/chromeos/fileapi/cros_mount_point_provider.cc
index f98b1382b5507d3a5c6554422aa49071c9997c4f..54beb96f47f6c1823423659a08a2d68fa00c6052 100644
--- a/webkit/chromeos/fileapi/cros_mount_point_provider.cc
+++ b/webkit/chromeos/fileapi/cros_mount_point_provider.cc
@@ -235,9 +235,14 @@ fileapi::FileSystemFileUtil* CrosMountPointProvider::GetFileUtil(
   return local_file_util_.get();
 }
 
-FilePath CrosMountPointProvider::GetPathForPermissionsCheck(
-    const FilePath& virtual_path) const {
-  return virtual_path;
+fileapi::FilePermissionPolicy CrosMountPointProvider::GetPermissionPolicy(
+    const fileapi::FileSystemURL& url, int permissions) const {
+  if (url.mount_type() == fileapi::kFileSystemTypeIsolated) {
+    // Permissions in isolated filesystems should be examined with
+    // FileSystem permission.
+    return fileapi::FILE_PERMISSION_USE_FILESYSTEM_PERMISSION;
+  }
+  return fileapi::FILE_PERMISSION_USE_FILE_PERMISSION;
 }
 
 fileapi::FileSystemOperation* CrosMountPointProvider::CreateFileSystemOperation(