On Windows, current implementation fails touching directories because it cannot open directories without specific flag |FILE_FLAG_BACKUP_SEMANTICS|.

      This patch makes it possible to touch them by setting the flag.

BUG=136490,137807
TEST=content_unittests --gtest_filter=\*MoveDirectory\*

Review URL: https://codereview.chromium.org/11198079

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@165338 0039d316-1c4b-4281-b951-d872f2087c98