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This CL changes Cryptographer::DecryptToString() to return a boolean
instead of an empty string to signal failure/success.

Change-Id: I12f1f65a177a23648a83d522900fa5c99f60ff4c
Reviewed-on: https://chromium-review.googlesource.com/c/1350617
Commit-Queue: Mohamed Amir Yosef <mamir@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611635}