Remove unused code

ios/chrome/browser/content_suggestions/content_suggestions_coordinator.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_coordinator.h"
 
 #include "base/mac/scoped_nsobject.h"
 #include "base/metrics/user_metrics.h"
 #include "base/metrics/user_metrics_action.h"
 #include "base/strings/sys_string_conversions.h"
@@ skipping 94 matching lines @@
   self.contentSuggestionsMediator = nil;
   self.alertCoordinator = nil;
   _visible = NO;
 }
 
 #pragma mark - ContentSuggestionsCommands
 
 - (void)openReadingList {
 }
 
-- (void)openFirstPageOfReadingList {
-}
-
-- (void)openFaviconAtIndex:(NSInteger)index {
-}
-
 - (void)openURL:(const GURL&)URL {
   // TODO(crbug.com/691979): Add metrics.
 
   [self.URLLoader loadURL:URL
                  referrer:web::Referrer()
                transition:ui::PAGE_TRANSITION_AUTO_BOOKMARK
         rendererInitiated:NO];
 
   [self stop];
 }
@@ skipping 99 matching lines @@
   if (!article)
     return;
 
   // TODO(crbug.com/691979): Add metrics.
   [self.contentSuggestionsMediator
       dismissSuggestion:article.suggestionIdentifier];
   [self.suggestionsViewController dismissEntryAtIndexPath:indexPath];
 }
 
 @end