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This reverts commit 2ed82a41.

Reason for revert: Looks like this is causing the Linux perf tests to crash in xlib_support.cc: https://ci.chromium.org/p/chrome/builders/ci/linux-perf/13312

Original change's description:
> Set Xlib error handler after GTK X11 initialization
>
> The default GTK error handler exits the process, which we don't want.
> We used to reset the error handler at some point after GTK
> initialization, but this became lost after r815319.
>
> Also refactor the XlibLoader instance to be global so it doesn't have
> to be created multiple times for each connection.
>
> R=​sky
>
> Bug: 1145929
> Change-Id: I73a3f27551534c2262bd8994d33e30fc2a0a4e27
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2527743
> Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
> Reviewed-by: Scott Violet <sky@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#825585}

TBR=sky@chromium.org,thomasanderson@chromium.org

Change-Id: Ie9f3614a8773220e0d6d6596d14c858a879a6704
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1145929
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2529152Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
Commit-Queue: Sami Kyöstilä <skyostil@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825761}