The body of new DivElement() is marked as returning a DivElement, instead of inferred to return Element.
The more precise receiver type allows svg polyfills to be excluded, allowsing the HtmlElement methods to be identified as the single target and inlined.
This tends to improve the code generated for idioms like
new DivElement()..classes.add('foo')
var e1 = new DivElement();
e1.children.add(e2);
BUG=
R=alanknight@google.com
Review-Url: https://codereview.chromium.org/2705213003 .
Stephen Adams
b7b12b564a