Blacklist Google Glass web browser from JS

This will prevent things like collapsing sections on the Google Glass
web browser, and other interactive extras that really don't work well
on the limited UI (although the browser supports JS the interaction
model doesn't let you do much usefully, so a static page is better).

bug: 56008
Change-Id: I406d8131d4a8b3b98328e6c624433b67a18db645
Merge "Blacklist Google Glass web browser from JS"