[Build] Switch androidx dependencies to use //third_party/androidx

This CL switches depenendencies on the
//third_party/android_deps:androidx alias to refer to
//third_party/androidx instead.

This CL was generated via:
find . -name *.gn -exec sed -i 's/android_deps:androidx/androidx:androidx/g' {} +

BUG=1064277

Change-Id: I3238cd487298ef733939ade5edf5898dd374c5ec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2693055
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Peter Kotwicz <pkotwicz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#853751}
GitOrigin-RevId: 0409372615dde3d990738a730b6f784d695bf678