I changed the test to avoid using mirrors. Somehow, import mirrors exposes a strange dart2js interceptor bug, but only in unchecked mode. (I only ran checked mode in my local tests :|. Doh)
Needs more investigation, but what seems to be happening:
* setInnerHtml creates a document
* it tries to append <base> to the <head>
* interceptor gets "Document" instead of "HtmlDocument"
* so the `document.head` fails
The bug seems to require Shadow DOM+unchecked+mirrors. Anyway, since it's totally unrelated to this test or the bug fix for 14700, I'm just working around it for now. Will open a separate issue.
R=sigmund@google.com
Review URL: https://codereview.chromium.org//54983011
git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@29767 260f80e4-7a28-3924-810f-c04153c831b5
jmesserly@google.com