Cancel JavaScript dialogs when an interstitial appears.

BUG=295695
TEST=See bug for repro steps.

Review URL: https://chromiumcodereview.appspot.com/24360011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@225026 0039d316-1c4b-4281-b951-d872f2087c98
void WebContentsImpl::ShowCreatedWidget(int route_id,
                                        const gfx::Rect& initial_pos) {
  ShowCreatedWidget(route_id, false, initial_pos);
}

void WebContentsImpl::ShowCreatedWidget(int route_id,
                                        const gfx::Rect& initial_pos) {
  ShowCreatedWidget(route_id, false, initial_pos);
}
