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BrowserGpuClientDelegate might have been destroyed when
OnEstablishGpuChannel callback is run. Although this callback does not
use |this| and just runs the other callback passed to it, it is
technically an undefined behavior. Making it a non-member function,
helps us avoid this undefined behavior.

BUG=872140,872219,872244

Change-Id: Id7641c6c3ff2dcb153e9ed9b245013e878cc947a
Reviewed-on: https://chromium-review.googlesource.com/1169964Reviewed-by: Antoine Labour <piman@chromium.org>
Commit-Queue: Mohsen Izadi <mohsen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582031}