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StackSamplingProfiler.ProfileDeserializationTime is recorded for every
profile to deserialize, which can be expensive when a lot of profiles
are pending upload. Since we have already got enough data for these
metrics, we should retire them.

Bug: 851163
Change-Id: I703e8b01752832d9574e804b1a28c2a2bfd0058e
Reviewed-on: https://chromium-review.googlesource.com/c/1332772
Commit-Queue: Xi Cheng <chengx@chromium.org>
Reviewed-by: Mike Wittman <wittman@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607450}