[Unit Tests] MultiBrowser tests fail on Mac/Safari

[redmunds]

MultiBrowser (experimental) - Live Development tests fail on Mac OS X 10.8 with Safari 6.2

I guess I missed that this comment had not been addresses in original PR. Unit Test failures are High Priority, so we need to either fix these ASAP or disabled them.

cc @busykai @sebaslv

[busykai]

@redmunds, with apologies for letting it slip in, created #10129 to address this.

[redmunds]

Confirmed. Closing.