Revert "Bug 1977019 - re-enable hw video decoding testing. r=media-playback-reviewers,jolin" for causing win mda failures on test_hw_video_decoding.html This reverts commit 158474bdc0cf585b701bc47921f0a7d84f7bb84d.

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−<style>
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−	* {
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−		margin: 0;
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−		padding: 0;
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−		border: 0;
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−		background: blue;
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−	}
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−</style>