Suggested Articles can be dismissed

ios/chrome/browser/content_suggestions/content_suggestions_mediator.mm

Index: ios/chrome/browser/content_suggestions/content_suggestions_mediator.mm
diff --git a/ios/chrome/browser/content_suggestions/content_suggestions_mediator.mm b/ios/chrome/browser/content_suggestions/content_suggestions_mediator.mm
index 55e62e62f73165e55b1c91af4e82f595e123916d..52b7c7caca1b39dc294f10938fbf5f2cdd9aeb37 100644
--- a/ios/chrome/browser/content_suggestions/content_suggestions_mediator.mm
+++ b/ios/chrome/browser/content_suggestions/content_suggestions_mediator.mm
@@ -133,6 +133,8 @@ ntp_snippets::ContentSuggestion::ID SuggestionIDForSectionID(
 @synthesize dataSink = _dataSink;
 @synthesize sectionInformationByCategory = _sectionInformationByCategory;
 
+#pragma mark - Public
+
 - (instancetype)initWithContentService:
     (ntp_snippets::ContentSuggestionsService*)contentService {
   self = [super init];
@@ -145,6 +147,16 @@ ntp_snippets::ContentSuggestion::ID SuggestionIDForSectionID(
   return self;
 }
 
+- (void)dismissSuggestion:(ContentSuggestionIdentifier*)suggestionIdentifier {
+  ContentSuggestionsCategoryWrapper* categoryWrapper =
+      [self categoryWrapperForSectionInfo:suggestionIdentifier.sectionInfo];
+  ntp_snippets::ContentSuggestion::ID suggestion_id =
+      ntp_snippets::ContentSuggestion::ID([categoryWrapper category],
+                                          suggestionIdentifier.IDInSection);
+
+  self.contentService->DismissSuggestion(suggestion_id);
+}
+
 #pragma mark - ContentSuggestionsDataSource
 
 - (NSArray<ContentSuggestion*>*)allSuggestions {