Disallow access to opaque CSS responses.

Bug: 848786
Change-Id: Ie53fbf644afdd76d7c65649a05c939c63d89b4ec
Reviewed-on: https://chromium-review.googlesource.com/1088335
Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Commit-Queue: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565537}
bool CSSStyleSheet::IsAlternate() const {
  if (owner_node_) {
    return owner_node_->IsElementNode() &&
           ToElement(owner_node_)->getAttribute(relAttr).Contains("alternate");
  }
  return alternate_from_constructor_;
}

bool CSSStyleSheet::IsAlternate() const {
  if (owner_node_) {
    return owner_node_->IsElementNode() &&
           ToElement(owner_node_)->getAttribute(relAttr).Contains("alternate");
  }
  return alternate_from_constructor_;
}
