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::NotifyNavigationEntryCommitted(
    const LoadCommittedDetails& load_details) {
  FOR_EACH_OBSERVER(
      WebContentsObserver, observers_, NavigationEntryCommitted(load_details));
}

void WebContentsImpl::NotifyNavigationEntryCommitted(
    const LoadCommittedDetails& load_details) {
  FOR_EACH_OBSERVER(
      WebContentsObserver, observers_, NavigationEntryCommitted(load_details));
}
