ntp_tiles: Cleanup enum names

ios/chrome/browser/ui/ntp/most_visited_cell.mm

 // Copyright 2016 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/ui/ntp/most_visited_cell.h"
 
 #include <memory>
 
 #import "base/ios/weak_nsobject.h"
 #include "base/mac/bind_objc_block.h"
@@ skipping 28 matching lines @@
 const CGFloat kLabelTextColor = 0.314;
 const CGFloat kMaximumWidth = 73;
 const CGFloat kMaximumHeight = 100;
 
 @interface MostVisitedCell () {
   // Backs property with the same name.
   GURL _URL;
   // Weak reference to the relevant BrowserState.
   ios::ChromeBrowserState* _browserState;
   // Backs property with the same name.
-  ntp_tiles::metrics::MostVisitedTileType _tileType;
+  ntp_tiles::metrics::NTPTileType _tileType;
 
   base::scoped_nsobject<UILabel> _label;
   base::scoped_nsobject<UILabel> _noIconLabel;
   base::scoped_nsobject<UIImageView> _imageView;
   // Used to cancel tasks for the LargeIconService.
   base::CancelableTaskTracker _cancelable_task_tracker;
 }
 // Set the background color and center the first letter of the site title (or
 // domain if the title is a url).
 - (void)updateIconLabelWithColor:(UIColor*)textColor
@@ skipping 173 matching lines @@
 }
 
 - (void)setImage:(UIImage*)image {
   [_imageView setBackgroundColor:nil];
   [_noIconLabel setText:nil];
   [_imageView setImage:image];
   _tileType = ntp_tiles::metrics::ICON_REAL;
 }
 
 @end