Switch to equalIgnoringASCIICase throughout modules/accessibility

BUG=627682

Review-Url: https://codereview.chromium.org/2793913007
Cr-Commit-Position: refs/heads/master@{#461858}
bool AXLayoutObject::isLoaded() const {
  return !m_layoutObject->document().parser();
}

bool AXLayoutObject::isLoaded() const {
  return !m_layoutObject->document().parser();
}
