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This reverts commit f4c20b08.

Now that gles2_cmd_decoder deletes the group before |surface_|, we
shouldn't need to handle this case.

Bug: 718117
Change-Id: Ia2808674fc91d7b1d43525397d6e598f483d0909
Reviewed-on: https://chromium-review.googlesource.com/576060Reviewed-by: Thomas Guilbert <tguilbert@chromium.org>
Commit-Queue: Frank Liberato <liberato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487584}