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Previously the test gives 400 ms timeout to wait for |onfocus| event
to happen, while sometimes 400 ms is simply not enough, which result
in flakiness.

The solution is to remove this timeout restriction if we are expecting
an onfocus event to happen.

Note: According to html spec: https://html.spec.whatwg.org/#attr-fe-autofocus,
topDocument's autofocus processed flag initially is false and is set to
true after flushing autofocus candidates, i.e. flush of autofocus
candidates only happens once per page load.
In order to test the behaviour with both focus-without-user-activation
on and off, two test files are necessary:
 - focus-without-user-activation-disabled-tentative.html
 - focus-without-user-activation-enabled-tentative.sub.html

Skipping focus-without-user-activation-enabled-tentative.sub.html
because the desired behaviour is not yet implemented.

Bug: 1067482
Change-Id: I3d1c8f77309054bbad0e666543372e28040ddcd2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2202677Reviewed-by: Ian Clelland <iclelland@chromium.org>
Commit-Queue: Charlie Hu <chenleihu@google.com>
Cr-Commit-Position: refs/heads/master@{#772309}