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This reverts commit 822a9853.

Reason for revert: crbug.com/1098750

Original change's description:
> Ensure no frames have been decoded for video context loss tests.
> 
> Once we have a valid video frame back from the decoder, we assume the
> decoder is good and toss the encoded data we hold onto for fallback.
> 
> It's unclear to me how the current tests have ever worked. Since we
> only fire canplaythrough after 4 frames have been decoded.
> 
> The fix for this is to ensure we don't decode any frames before
> triggering the gpu crash. This is fine for the purpose of this test
> which is for testing the rendering and not decoding.
> 
> R=​kbr
> 
> Bug: 1082761
> Change-Id: I7e798ff219ded36582b1576919b6e5bf9541f5fb
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2258772
> Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
> Reviewed-by: Kenneth Russell <kbr@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#781665}

TBR=dalecurtis@chromium.org,kbr@chromium.org

Change-Id: I02d1798b3799971d24229d95150cc76113ff9575
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1082761
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2264254Reviewed-by: Behdad Bakhshinategh <behdadb@chromium.org>
Commit-Queue: Behdad Bakhshinategh <behdadb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781854}