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As agrieve@ suggested, changed to use android_deps tool to get androidx test libraries from maven.
This can be easier to add more binaries and upgrade by version later.
Doc: https://chromium.googlesource.com/chromium/src/+/HEAD/tools/android/roll/android_deps/README.md

Bug: 900746
Change-Id: I631ed39e4bb07719ffe7d49c928380223def29af
Reviewed-on: https://chromium-review.googlesource.com/c/1478257Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Peter Wen <wnwen@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Yun Liu <yliuyliu@google.com>
Cr-Commit-Position: refs/heads/master@{#634813}