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In order to migrate java.net.URI to GURL the junit tests that rely on
java.net.URI need to be moved to a test apk that supports the native
library.

This change moves the PartnerBrowserCustomizationsUnitTest unittests
from junit to unit_tests (Android only). These tests should be just as
fast as they were as junit tests (and much faster than chrome_test_apk
unit tests).

Bug: 783819
Change-Id: I61fe3e37bbf4986b93e1a47d9ee348f19e97372e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1991736
Commit-Queue: Michael Thiessen <mthiesse@chromium.org>
Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#730249}