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This reverts commit b2925a91.

Reason for revert:  The re-enabled test is failing on several android builders

Original change's description:
> Wait for GPU initialization completion
>
> In RTC video decoder factory, wait until initialization of GPU is
> finished before querying supported formats and creating a decoder.
> Timeout is configurable via RtcDecoderSupportTimeout field trial.
> The feature is enabled by default. The default timeout is 10 seconds.
>
> Bug: 1047994
> Change-Id: I9d827507664228f903e4ce46e2949785b13192ba
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2411935
> Reviewed-by: Guido Urdaneta <guidou@chromium.org>
> Reviewed-by: Dan Sanders <sandersd@chromium.org>
> Commit-Queue: Sergey Silkin <ssilkin@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#811143}

TBR=fdoray@chromium.org,sandersd@chromium.org,guidou@chromium.org,chromium-reviews@chromium.org,etiennep@chromium.org,ssilkin@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1047994
Change-Id: I19aec959a1542425d747b58acafdcaab3721b6aa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2438570Reviewed-by: Patrick Noland <pnoland@chromium.org>
Commit-Queue: Patrick Noland <pnoland@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811859}