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Also moves the implementation of BookmarkTableCellTitleEditDelegate to
BookmarkHomeViewController, as that was only referenced by one of the data
source methods.

Makes several BookmarkTableView methods public in order to ease migration.

BUG=840381

Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Ia4e1f41ed76c44a763771799b0ec35da90d8ef21
Reviewed-on: https://chromium-review.googlesource.com/1048073
Commit-Queue: Rohit Rao <rohitrao@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556752}