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This is a reland of ae52b2a4 with fixes
for robolectric tests, which run on the JVM which appears to have
stricter verification checks.

Original change's description:
> [WebLayer] Change the return type of Fragment.getActivity() to Activity.
>
> This CL adds the ability to specify a script in an android_aar_prebuilt
> rule that can modify prebuilt jar files, and adds a script to change
> Fragment.getActivity() and Fragment.requireActivity() to return an
> Activity instead of a FragmentActivity.
>
> This is the first CL in a chain that will allow us to remove the fake
> activity we create when embedding Fragments that cross classloader
> boundaries.
>
> Bug: 1123216
> Change-Id: I4b9d3ca5f9c3a4d86e08d64f49d601c08fca9a70
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2432413
> Reviewed-by: Theresa  <twellington@chromium.org>
> Reviewed-by: Andrew Grieve <agrieve@chromium.org>
> Commit-Queue: Robbie McElrath <rmcelrath@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#823582}

Bug: 1123216
Change-Id: I83ed0c47cda12e4a71ed90cc0bce4cde2a07782d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2521343Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Commit-Queue: Robbie McElrath <rmcelrath@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826944}