Failing HTML entity unescaping test in HTML2IncDom

[mbrukman]

In a recent build which just changes the base Ubuntu OS image used by Travis, and a required change from Oracle JDK 8 → OpenJDK 8, we see the following failure:

Chrome 84.0.4147 (Windows 7 0.0.0) HTML2IncDom should unescape html entities inside element attributes FAILED
	AssertionError: expected '<form action="actionurl?foo=&quot;&lt;2&quot;&amp;bar=&gt;bar"></form>' to equal '<form action="actionurl?foo=&quot;<2&quot;&amp;bar=>bar"></form>'
	    at Function.assert.strictEqual (node_modules/chai/chai.js:2329:32)
	    at Context.<anonymous> (/tmp/packages/metal-incremental-dom/test/html/HTML2IncDom.js:48:10)

I'm not sure what the correct expected behavior here is, so it's unclear what needs to be fixed. It appears that < and > were expected to be changed to < and >, respectively, but appears that's not happening, and unclear if that's due to a more recent version of Chrome or something else changing in the environment, as the last successful build in this repo was over a year ago.