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NavigationSuggestion.Event histogram records each lookalike domain in
a redirect chain as a separate entry. This slightly overcounts lookalike
matches. This CL changes the histogram name to
NavigationSuggestion.Event2 and records only one entry per navigation.

Bug: 1136296
Change-Id: Icc0beae3d497718a7700f1875db7e5646e729fc6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2459430
Commit-Queue: Mustafa Emre Acer <meacer@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Chris Thompson <cthomp@chromium.org>
Reviewed-by: Joe DeBlasio <jdeblasio@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#816816}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2473064
Cr-Commit-Position: refs/heads/master@{#817534}