GitLab

This removes the dependency of //c/b/u/gtk on //c/b/u.  This will
allow us to move //c/b/u/gtk out of //c/b to a better home like
//ui/gtk once the //content dependency is removed in a separate CL.

This also removes some select file dialog tests which had all of
their tests disabled and never added any value.

R=sky
BUG=None

Change-Id: I38403a967593c76ea55c14315a63a8190e5cae33
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2093015Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748888}