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ContentHash class was previously tested indirectly: in a more
integration-like approach, for example, from ContentVerifyJobUnittest
and slightly from ContentHashFetcherTest. This commit adds its own test
for ContentHash.

This will be used in https://crbug.com/958794 to test ContentHash work
with unsigned hashes.

Bug: 958794, 796395
Change-Id: Ica75dac2a48250f12d5729126ecf397a8168061e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1844966
Commit-Queue: Oleg Davydov <burunduk@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706885}