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These errors should only occur when the X server is buggy, which we can't do do
much about. Continuing running seems to be harmless (tested in an X11 forwarding
environment), so just remove the DCHECKs.

BUG=1029486,701023
R=sky

Change-Id: I751991f8a2c222679ecb690349beaafff8e2ba49
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1947188Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Auto-Submit: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#731805}