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This CL cleans up the UMA metric code for the Autofill.FormDynamicity
metric, which is not needed anymore.

Bug: 1082744
Change-Id: I4a5efe995edae005b7a431ad2d0975b06dd05d81
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2252181Reviewed-by: Matthias Körber <koerber@google.com>
Commit-Queue: Christoph Schwering <schwering@google.com>
Cr-Commit-Position: refs/heads/master@{#781791}