Specify 'true' to force creating the new directory in MigrateFromOldSandbox

A tiny fallout from issue 7489038

BUG=none
TEST=green bots

Review URL: http://codereview.chromium.org/7511008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@95581 0039d316-1c4b-4281-b951-d872f2087c98

webkit/fileapi/obfuscated_file_system_file_util.cc

@@ -897,7 +897,7 @@ bool ObfuscatedFileSystemFileUtil::MigrateFromOldSandbox(
   if (dest_root.empty())
     return false;
   FileSystemDirectoryDatabase* db = GetDirectoryDatabase(
-      origin_url, type, false);
+      origin_url, type, true);
   if (!db)
     return false;