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After [1], multiple MessagePumpGlibs may be created, so the workaround
for Ozone/X11 is no longer necessary.

[1] https://chromium-review.googlesource.com/c/chromium/src/+/2343314

BUG=1078392
R=rjkroege
CC=spang

Change-Id: I985c83e21a17e802fe9356c6cbd6c16513487907
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2364796
Auto-Submit: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Robert Kroeger <rjkroege@chromium.org>
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800992}