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Sometimes, the status icon was shown in unexpected timing. This might be because the animation is re-fired when the dom is restyled. This patch fixes it.

BUG=none
TEST=Open window->play video->pause->close window. Repeat it 20 times and observe no issue.

Review URL: https://codereview.chromium.org/573233002

Cr-Commit-Position: refs/heads/master@{#295895}