Implement delegation to Metro file pickers.

R=cpu@chromium.org,robertshield@chromium.org
BUG=None
TEST=None


Review URL: https://chromiumcodereview.appspot.com/10310103

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@136624 0039d316-1c4b-4281-b951-d872f2087c98
void SelectFileDialogImpl::ListenerDestroyed() {
  listener_ = NULL;
}

void SelectFileDialogImpl::ListenerDestroyed() {
  listener_ = NULL;
}
