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This is already checked on the browser side and should never be sent to
the renderer.

Bug: 1117282
Change-Id: Ic3a5f1501a8961e5b07c6a975979bae7ec9345f8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2389232Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803917}