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This method has no user besides its own unit test, and we want to remove
all non-const methods from VideoFrameLayout.

BUG=876986
TEST=built vdatest and Chromium.

Change-Id: I5f332416c25a747685f2194989a61df225bb1159
Reviewed-on: https://chromium-review.googlesource.com/1186286
Commit-Queue: Alexandre Courbot <acourbot@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: John Rummell <jrummell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585758}