Switch to equalIgnoringASCIICase throughout modules/accessibility

BUG=627682

Review-Url: https://codereview.chromium.org/2793913007
Cr-Commit-Position: refs/heads/master@{#461858}
AXNodeObject* AXNodeObject::create(Node* node,
                                   AXObjectCacheImpl& axObjectCache) {
  return new AXNodeObject(node, axObjectCache);
}

AXNodeObject* AXNodeObject::create(Node* node,
                                   AXObjectCacheImpl& axObjectCache) {
  return new AXNodeObject(node, axObjectCache);
}
