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The "is webkit" heuristic only checks that self.internals exists;
however, this is also true on chromium. Chromium however does not have
an "internals.xrTest", this expands the "is webkit" heuristic to also
account for the presence of "internals.xrTest" and thus ensure chromium
tests run

Fixed: 1072929
Change-Id: Ieba043ba1634b393905e4494d0c59294aa6df12b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2159320
Commit-Queue: Alexander Cooper <alcooper@chromium.org>
Auto-Submit: Alexander Cooper <alcooper@chromium.org>
Reviewed-by: Brandon Jones <bajones@chromium.org>
Reviewed-by: Klaus Weidner <klausw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#761158}