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Currently, the only case where remote frames let the blink compositor
set contents_opaque for a remote frame is when displaying the sad
tab graphic for a crashed frame. The sad tab graphic is not opaque,
and we shouldn't ever set contents_opaque on its layer, regardless of
the style of its containing <iframe> element.

Bug: 1069546

Change-Id: I04636d2b6cead84d224913563fd6e9bab34069d1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2606659Reviewed-by: danakj <danakj@chromium.org>
Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Commit-Queue: Stefan Zager <szager@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840045}