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We shouldn't be parsing json data from untrusted sources in the GPU
process. For this reason we allow skottie objects to be used only by the
GpuChannel associated with the browser process. Fix an error in
enforcing this.

R=malaykeshav@chromium.org

Bug: 894635
Change-Id: If5b0bfb3c95b7475e735b0b74e69d8c1cf533020
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2112334
Auto-Submit: Khushal <khushalsagar@chromium.org>
Commit-Queue: Malay Keshav <malaykeshav@chromium.org>
Reviewed-by: Malay Keshav <malaykeshav@chromium.org>
Cr-Commit-Position: refs/heads/master@{#752062}