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We use one X visual and thus all GLContexts are compatible with each
other and this method is not needed.

Bug: 902943
Change-Id: I51d8f7527b52117c0b1535cc7f3d706030c3ffda
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2001397
Commit-Queue: Kramer Ge <fangzhoug@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Peng Huang <penghuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732275}