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These changes were manually added into build.gn file for androidx
migration. They are no longer needed now that the import calls have
moved over.

Bug: 1067050,1067070
Change-Id: Ia7cd36bf52b39444a2dec6bdc065e41b187a2c1c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2160011Reviewed-by: Richard Coles <torne@chromium.org>
Reviewed-by: Peter Wen <wnwen@chromium.org>
Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Commit-Queue: Peter Wen <wnwen@chromium.org>
Commit-Queue: benjamin joyce <bjoyce@chromium.org>
Cr-Commit-Position: refs/heads/master@{#762093}