Remove WebFrame::canHaveSecureChild

To simplify the public API, ServiceWorkerNetworkProvider can do the
parent walk itself.

Follow-up to https://crrev.com/ad1850962644e19.

BUG=607543

Review-Url: https://codereview.chromium.org/2082493002
Cr-Commit-Position: refs/heads/master@{#400896}
void Document::updateStyleAndLayoutTreeForNode(const Node* node)
{
    DCHECK(node);
    if (!needsLayoutTreeUpdateForNode(*node))
        return;
    updateStyleAndLayoutTree();
}

void Document::updateStyleAndLayoutTreeForNode(const Node* node)
{
    DCHECK(node);
    if (!needsLayoutTreeUpdateForNode(*node))
        return;
    updateStyleAndLayoutTree();
}
