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Change HistoryServiceObservers to use the new OnUrlsDeleted method.

Bug: 839798
Change-Id: Ibc62d194a7905e2fe357c098e77dd5db486e89ff
Reviewed-on: https://chromium-review.googlesource.com/1059250Reviewed-by: Jan Krcal <jkrcal@chromium.org>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: Varun Khaneja <vakh@chromium.org>
Commit-Queue: Christian Dullweber <dullweber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#559009}