[Bookmark suggestions] Remove an obsolete pref entry

ios/chrome/browser/prefs/browser_prefs.mm

Index: ios/chrome/browser/prefs/browser_prefs.mm
diff --git a/ios/chrome/browser/prefs/browser_prefs.mm b/ios/chrome/browser/prefs/browser_prefs.mm
index 568823b883c782edfbb9b9957163d88e013d64ab..5a50138da5d07816b92da36d50dfa13374a7044e 100644
--- a/ios/chrome/browser/prefs/browser_prefs.mm
+++ b/ios/chrome/browser/prefs/browser_prefs.mm
@@ -13,7 +13,6 @@
 #import "components/handoff/handoff_manager.h"
 #include "components/metrics/metrics_pref_names.h"
 #include "components/network_time/network_time_tracker.h"
-#include "components/ntp_snippets/bookmarks/bookmark_suggestions_provider.h"
 #include "components/ntp_snippets/category_rankers/click_based_category_ranker.h"
 #include "components/ntp_snippets/content_suggestions_service.h"
 #include "components/ntp_snippets/remote/remote_suggestions_provider_impl.h"
@@ -97,7 +96,6 @@ void RegisterBrowserStatePrefs(user_prefs::PrefRegistrySyncable* registry) {
   gcm::GCMChannelStatusSyncer::RegisterProfilePrefs(registry);
   HostContentSettingsMap::RegisterProfilePrefs(registry);
   HttpServerPropertiesManagerFactory::RegisterProfilePrefs(registry);
-  ntp_snippets::BookmarkSuggestionsProvider::RegisterProfilePrefs(registry);
   ntp_snippets::ClickBasedCategoryRanker::RegisterProfilePrefs(registry);
   ntp_snippets::ContentSuggestionsService::RegisterProfilePrefs(registry);
   ntp_snippets::RemoteSuggestionsProviderImpl::RegisterProfilePrefs(registry);