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Ensure that element fetch time is only logged once per fetch request.

Bug: 228355
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I997115965c1548ed02b58c29cca6896607b3761d
Reviewed-on: https://chromium-review.googlesource.com/942608
Commit-Queue: Mike Dougherty <michaeldo@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#540368}