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And rename from MockBlob to FakeBlob as that seems like a better name.

Bug: none
Change-Id: I560756e200a8712f7ba335130522158195633c5a
Reviewed-on: https://chromium-review.googlesource.com/1114126
Commit-Queue: Marijn Kruisselbrink <mek@chromium.org>
Commit-Queue: Daniel Murphy <dmurph@chromium.org>
Reviewed-by: Daniel Murphy <dmurph@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570204}