Actually fix bug 47793 for Opera for real this time

I trusted you guys when you told me to use DOM .focus() instead of
jQuery's .focus() and didn't test well enough :( The former doesn't
work, the latter does.

Follow-up to I7962f59b.

Bug: 47793
Change-Id: Iddfb8d7c99325b6c7a5d151948b57cfa5f0a6a62
Merge "Actually fix bug 47793 for Opera for real this time"