The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/98264ec53c6ff8523e659903bd489483686622a5

commit 98264ec53c6ff8523e659903bd489483686622a5
Author: gambard <gambard@chromium.org>
Date: Mon May 15 16:26:18 2017

ContentSuggestionsDataSource returns CollectionViewItem

Before this CL, ContentSuggestionsDataSource returned ContentSuggestion.
The ContentSuggestion were converted into CollectionViewItem in the
ContentSuggestionsCollectionUpdater, then added to the collection.

This CL changes the ContentSuggestionsDataSource and makes it return
CollectionViewItem directly. ContentSuggestion is removed as it is no longer
needed.

BUG= 720271 ,  706344 

Review-Url: https://codereview.chromium.org/2877513003
Cr-Commit-Position: refs/heads/master@{#471784}

[modify] https://crrev.com/98264ec53c6ff8523e659903bd489483686622a5/ios/chrome/browser/content_suggestions/content_suggestions_mediator.mm
[modify] https://crrev.com/98264ec53c6ff8523e659903bd489483686622a5/ios/chrome/browser/content_suggestions/mediator_util.h
[modify] https://crrev.com/98264ec53c6ff8523e659903bd489483686622a5/ios/chrome/browser/content_suggestions/mediator_util.mm
[modify] https://crrev.com/98264ec53c6ff8523e659903bd489483686622a5/ios/chrome/browser/ui/content_suggestions/BUILD.gn
[modify] https://crrev.com/98264ec53c6ff8523e659903bd489483686622a5/ios/chrome/browser/ui/content_suggestions/cells/BUILD.gn
[modify] https://crrev.com/98264ec53c6ff8523e659903bd489483686622a5/ios/chrome/browser/ui/content_suggestions/cells/content_suggestions_item.h
[modify] https://crrev.com/98264ec53c6ff8523e659903bd489483686622a5/ios/chrome/browser/ui/content_suggestions/cells/content_suggestions_item.mm
[modify] https://crrev.com/98264ec53c6ff8523e659903bd489483686622a5/ios/chrome/browser/ui/content_suggestions/cells/content_suggestions_item_unittest.mm
[modify] https://crrev.com/98264ec53c6ff8523e659903bd489483686622a5/ios/chrome/browser/ui/content_suggestions/cells/content_suggestions_most_visited_item.h
[modify] https://crrev.com/98264ec53c6ff8523e659903bd489483686622a5/ios/chrome/browser/ui/content_suggestions/cells/content_suggestions_most_visited_item.mm
[modify] https://crrev.com/98264ec53c6ff8523e659903bd489483686622a5/ios/chrome/browser/ui/content_suggestions/cells/content_suggestions_text_item.h
[modify] https://crrev.com/98264ec53c6ff8523e659903bd489483686622a5/ios/chrome/browser/ui/content_suggestions/cells/content_suggestions_text_item.mm
[add] https://crrev.com/98264ec53c6ff8523e659903bd489483686622a5/ios/chrome/browser/ui/content_suggestions/cells/suggested_content.h
[delete] https://crrev.com/9a2fd54ac4061f0c26a00e3d9d3396095c8e1675/ios/chrome/browser/ui/content_suggestions/content_suggestion.h
[delete] https://crrev.com/9a2fd54ac4061f0c26a00e3d9d3396095c8e1675/ios/chrome/browser/ui/content_suggestions/content_suggestion.mm
[modify] https://crrev.com/98264ec53c6ff8523e659903bd489483686622a5/ios/chrome/browser/ui/content_suggestions/content_suggestions_collection_updater.h
[modify] https://crrev.com/98264ec53c6ff8523e659903bd489483686622a5/ios/chrome/browser/ui/content_suggestions/content_suggestions_collection_updater.mm
[modify] https://crrev.com/98264ec53c6ff8523e659903bd489483686622a5/ios/chrome/browser/ui/content_suggestions/content_suggestions_collection_updater_unittest.mm
[modify] https://crrev.com/98264ec53c6ff8523e659903bd489483686622a5/ios/chrome/browser/ui/content_suggestions/content_suggestions_data_source.h
[modify] https://crrev.com/98264ec53c6ff8523e659903bd489483686622a5/ios/chrome/browser/ui/content_suggestions/content_suggestions_view_controller.h
[modify] https://crrev.com/98264ec53c6ff8523e659903bd489483686622a5/ios/chrome/browser/ui/content_suggestions/content_suggestions_view_controller.mm
[modify] https://crrev.com/98264ec53c6ff8523e659903bd489483686622a5/ios/chrome/browser/ui/content_suggestions/identifier/content_suggestion_identifier.h
[modify] https://crrev.com/98264ec53c6ff8523e659903bd489483686622a5/ios/chrome/browser/ui/content_suggestions/identifier/content_suggestions_section_information.h
[modify] https://crrev.com/98264ec53c6ff8523e659903bd489483686622a5/ios/chrome/browser/ui/settings/material_cell_catalog_view_controller.mm