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This is necessary for androidx.browser.
Androidx.browser provides the Android APIs that allow us to support Custom Tabs and
Trusted Web Activities - it's basically the new version of custom_tabs_client. Since
androidx.browser is an Android API, it must adhere to their API guidelines,
which involves using ListenableFuture instead of accepting Callbacks(see b/138381050)

Bug: 1016484
Change-Id: I1f0dde3533b6b03c5976ea85397d25e509600917
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1872642Reviewed-by: Peter Wen <wnwen@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Commit-Queue: benjamin joyce <bjoyce@google.com>
Cr-Commit-Position: refs/heads/master@{#714412}