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This CL moves the custom_tabs_client_example_apk target into the
Chromium repo. This means that we can remove the
third_party/custom_tabs_client dependency.

While moving the custom_tabs_client_example_apk target, it was updated
to depend on androidx.browser instead of the Android Support Library.
Support for browser actions was also removed as Chrome discontinued
support that feature half a year ago.

Bug: 980567
Change-Id: I716658d3407ef28630dea94d75e9f672eca797d2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2120724
Auto-Submit: Peter Conn <peconn@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Reviewed-by: Peter Conn <peconn@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Commit-Queue: Peter Conn <peconn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756593}