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In the event a ended event occurs before a timeupdate event, the
next timeupdate event would retrigger the seek step. So cleanup
all test advancement listeners during calls to SeekTestStep().

Also, enable console logs on Android by toggling the necessary
base::Feature to help debugging these flakes in the field.

Also, fix "undefined undefined" from showing up in console logs
when the video size information shows up. As a result of this
the way size tests are completed has been reimplemented to avoid
an extraneous title step.

R=jrummell

Change-Id: Ia3799eb4b16583ad3a8751f67e6e33cf0c5d5d20
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2036365
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: John Rummell <jrummell@chromium.org>
Auto-Submit: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738030}