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A delegate interface PageInfoDelegate has been introduced
to allow the embedder to customize PageInfo.
ChromePageInfoDelegate is Chrome's implementation of it.

There will be follow up work to clean up chrome dependencies
from PageInfo, after which, PageInfo can be moved to components.

Bug: 1052375

Change-Id: I9b2ac5811ede505171787f23120cc46927e90f4d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2089710
Commit-Queue: Mugdha Lakhani <nator@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#751995}