Remove old AMP UMA metrics.

landed, we have now migrated to measuring AMP performance without having
to match against hard-coded URLs.

This change removes the old UMA logic with hard-coded URL matching.

Change-Id: I8cd9d5d5491f90b2e3357ed81ba0eadb0ed77732
Bug: 939333
Reviewed-by: Annie Sullivan <>
Reviewed-by: Charlie Harrison <>
Commit-Queue: Bryan McQuade <>
Cr-Commit-Position: refs/heads/master@{#661494}
5 files changed