ntp_tiles: Cleanup enum names

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

 // 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.
 
 #ifndef IOS_CHROME_BROWSER_UI_NTP_MOST_VISITED_CELL_H_
 #define IOS_CHROME_BROWSER_UI_NTP_MOST_VISITED_CELL_H_
 
 #import <UIKit/UIKit.h>
 
 #include "components/ntp_tiles/metrics.h"
 #include "url/gurl.h"
 
 namespace ios {
 class ChromeBrowserState;
 }
 
 // Cell showing each most visited image, favicon and title.
 @interface MostVisitedCell : UICollectionViewCell
 
 // URL of the top site.
 @property(nonatomic, assign) GURL URL;
 // Reference to the relevant ChromeBrowserState
 @property(nonatomic, readonly) ios::ChromeBrowserState* browserState;
 // Type of tile (icon, scrabble tile, default)
-@property(nonatomic, readonly) ntp_tiles::metrics::MostVisitedTileType tileType;
+@property(nonatomic, readonly) ntp_tiles::TileVisualType tileType;
 
 // Set text of top site.
 - (void)setText:(NSString*)text;
 // Show the placeholder image in the cell instead of a most visited site.
 - (void)showPlaceholder;
 // Removes the placeholder image from the cell. Used to make a cell appear
 // empty/invisible.
 - (void)removePlaceholderImage;
 // Setup the display state of the cell.
 - (void)setupWithURL:(GURL)URL
                title:(NSString*)title
         browserState:(ios::ChromeBrowserState*)browserState;
 
 // Preferred maximum cell size.
 + (CGSize)maximumSize;
 @end
 
 #endif  // IOS_CHROME_BROWSER_UI_NTP_MOST_VISITED_CELL_H_