Cleanup ContentSuggestions, removing unused functions

ios/chrome/browser/ui/content_suggestions/content_suggestions_view_controller.mm

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "ios/chrome/browser/ui/content_suggestions/content_suggestions_view_controller.h"
 
 #include "base/mac/foundation_util.h"
 #import "ios/chrome/browser/ui/collection_view/cells/MDCCollectionViewCell+Chrome.h"
 #import "ios/chrome/browser/ui/collection_view/cells/collection_view_item.h"
 #import "ios/chrome/browser/ui/collection_view/collection_view_model.h"
 #import "ios/chrome/browser/ui/content_suggestions/content_suggestion.h"
 #import "ios/chrome/browser/ui/content_suggestions/content_suggestions_article_item.h"
 #import "ios/chrome/browser/ui/content_suggestions/content_suggestions_collection_updater.h"
 #import "ios/chrome/browser/ui/content_suggestions/content_suggestions_commands.h"
-#import "ios/chrome/browser/ui/content_suggestions/content_suggestions_item_actions.h"
 #import "ios/chrome/browser/ui/content_suggestions/content_suggestions_stack_item.h"
 #import "ios/chrome/browser/ui/content_suggestions/content_suggestions_stack_item_actions.h"
+#import "ios/chrome/browser/ui/content_suggestions/content_suggestions_text_item_actions.h"
 #import "ios/chrome/browser/ui/content_suggestions/expandable_item.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 namespace {
 const NSTimeInterval kAnimationDuration = 0.35;
 }  // namespace
 
-@interface ContentSuggestionsViewController ()<SuggestionsItemActions,
-                                               SuggestionsStackItemActions>
+@interface ContentSuggestionsViewController ()<SuggestionsStackItemActions>
 
 @property(nonatomic, strong)
     ContentSuggestionsCollectionUpdater* collectionUpdater;
 
 // Expand or collapse the |cell|, if it is a ContentSuggestionsExpandableCell,
 // according to |expand|.
 - (void)expand:(BOOL)expand cell:(UICollectionViewCell*)cell;
 
 @end
 
@@ skipping 54 matching lines @@
 - (void)expandCell:(UICollectionViewCell*)cell {
   [self expand:YES cell:cell];
 }
 
 #pragma mark - ContentSuggestionsFaviconCellDelegate
 
 - (void)openFaviconAtIndexPath:(NSIndexPath*)innerIndexPath {
   [self.suggestionCommandHandler openFaviconAtIndex:innerIndexPath.item];
 }
 
-#pragma mark - SuggestionsItemActions
-
-- (void)addNewItem:(id)sender {
-  [self.suggestionCommandHandler addEmptyItem];
-}
-
-#pragma mark - ContentSuggestionsCollectionUpdater forwarding
-
-- (void)addTextItem:(NSString*)title
-           subtitle:(NSString*)subtitle
-          toSection:(NSInteger)inputSection {
-  [self.collectionUpdater addTextItem:title
-                             subtitle:subtitle
-                            toSection:inputSection];
-}
-
 #pragma mark - SuggestionsStackItemActions
 
 - (void)openReadingListFirstItem:(id)sender {
   [self.suggestionCommandHandler openFirstPageOfReadingList];
 }
 
 #pragma mark - MDCCollectionViewStylingDelegate
 
 - (UIColor*)collectionView:(nonnull UICollectionView*)collectionView
     cellBackgroundColorAtIndexPath:(nonnull NSIndexPath*)indexPath {
@@ skipping 82 matching lines @@
   }
 
   ContentSuggestionsArticleItem* articleItem =
       base::mac::ObjCCastStrict<ContentSuggestionsArticleItem>(touchedItem);
 
   [self.suggestionCommandHandler displayContextMenuForArticle:articleItem
                                                       atPoint:touchLocation];
 }
 
 @end