Update MSE layout test expectations
Update MSE layout test expectations

Adds some crashes and failures seen during manual runs of
MediaSource layout tests on Android (309184, 303419, 323301,
323284, 302729).
Removes references for a couple MSE failures not recently
seen on flakiness dashboard (284779, 284793).

BUG=309184, 303419, 323301, 323284, 302729, 284779, 284793
TBR=acolwell@chromium.org

Review URL: https://codereview.chromium.org/113133003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@163731 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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