Remove unused code

ios/chrome/browser/content_suggestions/mediator_util.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/mediator_util.h"
 
 #include "base/strings/sys_string_conversions.h"
 #include "components/ntp_snippets/category.h"
 #import "ios/chrome/browser/content_suggestions/content_suggestions_category_wrapper.h"
 #import "ios/chrome/browser/ui/content_suggestions/identifier/content_suggestion_identifier.h"
@@ skipping 19 matching lines @@
   if (category.IsKnownCategory(ntp_snippets::KnownCategories::ARTICLES))
     return ContentSuggestionTypeArticle;
   if (category.IsKnownCategory(ntp_snippets::KnownCategories::READING_LIST))
     return ContentSuggestionTypeReadingList;
 
   return ContentSuggestionTypeEmpty;
 }
 
 ContentSuggestionsSectionID SectionIDForCategory(
     ntp_snippets::Category category) {
-  if (category.IsKnownCategory(ntp_snippets::KnownCategories::BOOKMARKS))
-    return ContentSuggestionsSectionBookmarks;
   if (category.IsKnownCategory(ntp_snippets::KnownCategories::ARTICLES))
     return ContentSuggestionsSectionArticles;
   if (category.IsKnownCategory(ntp_snippets::KnownCategories::READING_LIST))
     return ContentSuggestionsSectionReadingList;
 
   return ContentSuggestionsSectionUnknown;
 }
 
 ContentSuggestionsSectionLayout SectionLayoutForLayout(
     ntp_snippets::ContentSuggestionsCardLayout layout) {
@@ skipping 39 matching lines @@
     sectionInfo.title = base::SysUTF16ToNSString(categoryInfo->title());
   }
   return sectionInfo;
 }
 
 ntp_snippets::ContentSuggestion::ID SuggestionIDForSectionID(
     ContentSuggestionsCategoryWrapper* category,
     const std::string& id_in_category) {
   return ntp_snippets::ContentSuggestion::ID(category.category, id_in_category);
 }