Switch to equalIgnoringASCIICase throughout modules/accessibility

BUG=627682

Review-Url: https://codereview.chromium.org/2793913007
Cr-Commit-Position: refs/heads/master@{#461858}
bool AXNodeObject::nameFromContents() const {
  Node* node = getNode();
  if (!node || !node->isElementNode())
    return AXObject::nameFromContents();
  if (isHTMLSelectElement(node))
    return false;
  return AXObject::nameFromContents();
}

bool AXNodeObject::nameFromContents() const {
  Node* node = getNode();
  if (!node || !node->isElementNode())
    return AXObject::nameFromContents();
  if (isHTMLSelectElement(node))
    return false;
  return AXObject::nameFromContents();
}
