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The default Robolectric testrunner has some behaviors we want to override. By
default the Robolectric testrunner will download the Robolectric runtime
dependencies from the Maven central reposoitory. In addition, Robolectric won't
run at all if the API level in the AndroidManifest isn't officially supported by
Robolectric which isn't what we want.

BUG=448030

Review URL: https://codereview.chromium.org/942083003

Cr-Commit-Position: refs/heads/master@{#321819}