Switch to equalIgnoringASCIICase throughout modules/accessibility

BUG=627682

Review-Url: https://codereview.chromium.org/2793913007
Cr-Commit-Position: refs/heads/master@{#461858}
bool AXLayoutObject::isValidSelectionBound(const AXObject* boundObject) const {
  return getLayoutObject() && boundObject && !boundObject->isDetached() &&
         boundObject->isAXLayoutObject() && boundObject->getLayoutObject() &&
         boundObject->getLayoutObject()->frame() ==
             getLayoutObject()->frame() &&
         &boundObject->axObjectCache() == &axObjectCache();
}

bool AXLayoutObject::isValidSelectionBound(const AXObject* boundObject) const {
  return getLayoutObject() && boundObject && !boundObject->isDetached() &&
         boundObject->isAXLayoutObject() && boundObject->getLayoutObject() &&
         boundObject->getLayoutObject()->frame() ==
             getLayoutObject()->frame() &&
         &boundObject->axObjectCache() == &axObjectCache();
}
