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To adhere to Coding Guidelines for Cocoa, rename this method to
|webState:didPruneNavigationItemsWithCount:|.

Bug: 
Change-Id: Ibc07ab7012e1490b03e2e5ff814270ce4186ab11
Reviewed-on: https://chromium-review.googlesource.com/531464Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Mike Dougherty <michaeldo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#478822}