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The name "libgtkui" is misleading: we don't actually ship a
libgtkui.so, although this was planned at some point. Even if we did,
it probably still wouldn't make sense to have "lib" in the directory
name. This change renames the directory to simply gtk.

BUG=None
R=sky

Change-Id: Ib2380520c8605b4d4e0fd2d6ff9207caa50a406e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2011683
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Auto-Submit: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734325}