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This fixes a bug of EncodedDataHelper in reading ivf frame
header.

Bug: 1098142
Test: video.DecodeAccelSanity.vp9_1
Change-Id: Icaa6d6a41784bbc1b3bc1f7d967a35abb5635743
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2262022
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Commit-Queue: David Staessens <dstaessens@chromium.org>
Auto-Submit: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: David Staessens <dstaessens@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781700}