Deal with UA string of the Microsoft Edge

[markelog]

As noted by the @dmethvin.

See https://msdn.microsoft.com/en-us/library/hh869301%28v=vs.85%29.aspx

Since our tests (mostly support tests) depends on that.

[mgol]

Hmm, it seems I partially took care of it via 8e111df.

See also #2390 for a summary of where we're staying with MS Edge.

[mgol]

I've search the code from master and, apart from test/unit/support.js the event originalEvent test is the only place where we sniff for Chrome. In other places we only sniff for:

1. Android
2. iOS
3. Firefox (in one place, to disable focus tests).

No Chrome & IE. Therefore, the originalEvent test is the only place that's left to change (as you said, only the test description & message should be changed to include Edge).

That seems to be it.