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Rename tests to follow team convention

We agreed to prefer the ShouldXXX convention for new code. This patch
renames previously existing tests accordingly, prior to adding new ones
in follow-up patches, to avoid violating the local consistency
principle.

Bug: 830535
Change-Id: Idb9f87f06ff1e4d886f0c4d3d34180e43eca29f2
Reviewed-on: https://chromium-review.googlesource.com/1209483
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589140}