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This change updates the hardcoded error messages to match the latest
mocks.

Bug: 806868
Change-Id: I44eebf0c0ed988dca60f4537996667baf0443904
Reviewed-on: https://chromium-review.googlesource.com/c/1481413
Commit-Queue: Stephane Zermatten <szermatt@chromium.org>
Reviewed-by: Clemens Arbesser <arbesser@google.com>
Cr-Commit-Position: refs/heads/master@{#634653}