Valid elements are getting stripped

[westonruter]

Certain elements that should be allowed are now getting stripped. For example div and meta. This problem introduced (by me) in 372412b as part of #929.

Examples of elements that are getting removed:

<div>
		<label for="contact-form-comment-g9-message" class="grunion-field-label textarea">Message</label>
		<textarea name="g9-message" id="contact-form-comment-g9-message" rows="20" class="textarea"></textarea>
</div>
<div>
		<label for="g9-website" class="grunion-field-label url">Website</label>
		<input type="url" name="g9-website" id="g9-website" value="" class="url">
</div>
<div>
		<label for="g9-email" class="grunion-field-label email">Email<span>(required)</span></label>
		<input type="email" name="g9-email" id="g9-email" value="" class="email" required aria-required="true">
</div>
<div>
		<label for="g9-name" class="grunion-field-label name">Name<span>(required)</span></label>
		<input type="text" name="g9-name" id="g9-name" value="" class="name" required aria-required="true">
</div>
<meta property="og:locale" content="en_US">

<meta property="og:image:height" content="1200">

<meta property="og:image:width" content="2000">

<meta property="og:image" content="https://src.wordpress-develop.test/wp-content/uploads/2017/11/espresso-137.jpg">

<meta property="og:site_name" content="WordPress Develop22s">

<meta property="article:modified_time" content="2018-02-07T16:37:21+00:00">

<meta property="article:published_time" content="2017-11-27T06:10:23+00:00">

<meta property="og:description" content="This is a page with some basic contact information, such as an address and phone number. You might also try a plugin to add a contact form.">

<meta property="og:url" content="https://src.wordpress-develop.test/contact/">

<meta property="og:title" content="Contact">

<meta property="og:type" content="article">