Remove suggestions notified as invalid

ios/chrome/browser/content_suggestions/content_suggestions_mediator.mm

 // Copyright 2017 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/content_suggestions/content_suggestions_mediator.h"
 
 #include "base/mac/bind_objc_block.h"
 #include "base/memory/ptr_util.h"
 #include "base/optional.h"
 #include "base/strings/sys_string_conversions.h"
@@ skipping 180 matching lines @@
 
 - (void)contentSuggestionsService:
             (ntp_snippets::ContentSuggestionsService*)suggestionsService
                          category:(ntp_snippets::Category)category
                   statusChangedTo:(ntp_snippets::CategoryStatus)status {
   // Update dataSink.
 }
 
 - (void)contentSuggestionsService:
             (ntp_snippets::ContentSuggestionsService*)suggestionsService
-            SuggestionInvalidated:
+            suggestionInvalidated:
                 (const ntp_snippets::ContentSuggestion::ID&)suggestion_id {
-  // Update dataSink.
+  ContentSuggestionsCategoryWrapper* wrapper =
+      [[ContentSuggestionsCategoryWrapper alloc]
+          initWithCategory:suggestion_id.category()];
+  ContentSuggestionIdentifier* suggestionIdentifier =
+      [[ContentSuggestionIdentifier alloc] init];
+  suggestionIdentifier.IDInSection = suggestion_id.id_within_category();
+  suggestionIdentifier.sectionInfo = self.sectionInformationByCategory[wrapper];
+
+  [self.dataSink clearSuggestion:suggestionIdentifier];
 }
 
 - (void)contentSuggestionsServiceFullRefreshRequired:
     (ntp_snippets::ContentSuggestionsService*)suggestionsService {
   // Update dataSink.
 }
 
 - (void)contentSuggestionsServiceShutdown:
     (ntp_snippets::ContentSuggestionsService*)suggestionsService {
   // Update dataSink.
@@ skipping 40 matching lines @@
       wrapperWithCategory:category]] = sectionInfo;
 }
 
 - (ContentSuggestionsCategoryWrapper*)categoryWrapperForSectionInfo:
     (ContentSuggestionsSectionInformation*)sectionInfo {
   return [[self.sectionInformationByCategory allKeysForObject:sectionInfo]
       firstObject];
 }
 
 @end