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
bool WebContentsImpl::FocusLocationBarByDefault() {
  NavigationEntry* entry = controller_.GetActiveEntry();
  if (entry && entry->GetURL() == GURL(kAboutBlankURL))
    return true;
  return delegate_ && delegate_->ShouldFocusLocationBarByDefault(this);
}

bool WebContentsImpl::FocusLocationBarByDefault() {
  NavigationEntry* entry = controller_.GetActiveEntry();
  if (entry && entry->GetURL() == GURL(kAboutBlankURL))
    return true;
  return delegate_ && delegate_->ShouldFocusLocationBarByDefault(this);
}
