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The old code used dlsym(RTLD_DEFAULT), which will attempt to obtain the
symbol from libraries already loaded.  This works most of the time
because Xlib gets loaded by eg. GTK, but in cases where Xlib is not
already loaded (eg. certain ChromeOS setups), XFree will not be found,
leading to a crash.  The fix is to switch to the existing xlib_support
which internally does dlopen("libX11.so.6") so it shouldn't have this
issue.

R=sky

Bug: 1150918
Change-Id: I82d28cf86e187cc1213b607482f7bd1f4a8e2287
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2552209
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Auto-Submit: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#829901}