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This CL adds a metrics for click events on the URL in chrome://downloads
for Chromenav.

Bug: 957346
Change-Id: I7460f5c2268c375b32c7fbede050c194a57f3fcc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1601691Reviewed-by: David Trainor <dtrainor@chromium.org>
Reviewed-by: calamity <calamity@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Reviewed-by: Dan Beam <dbeam@chromium.org>
Reviewed-by: Min Qin <qinmin@chromium.org>
Commit-Queue: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#658796}