[WebViewLayoutTests] Unexpose WebGL2ComputeRenderingContext

This interface is not supported on android and should not be
exposed. Currently it's causing some WebView bots to fail.

BUG=865569
NOTRY=true
TBR=paulmiller@chromium.org,tobiasjs@chromium.org

Change-Id: I1884dafea2d3db72fd5f0b91eb710dec9ff29bb6
Reviewed-on: https://chromium-review.googlesource.com/1144143
Reviewed-by: Tim Volodine <timvolodine@chromium.org>
Commit-Queue: Tim Volodine <timvolodine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576577}
1 file changed