Move FaviconAttributes to UI

ios/chrome/browser/favicon/favicon_attributes.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_FAVICON_FAVICON_ATTRIBUTES_H_
-#define IOS_CHROME_BROWSER_FAVICON_FAVICON_ATTRIBUTES_H_
-
-#import <UIKit/UIKit.h>
-
-// Attributes of a favicon. A favicon is represented either with an image or
-// with a fallback monogram of a given color and background color.
-@interface FaviconAttributes : NSObject
-
-// Favicon image. Can be nil. If it is nil, monogram string and color are
-// guaranteed to be not nil.
-@property(nonatomic, readonly, strong) UIImage* faviconImage;
-// Favicon monogram. Only available when there is no image.
-@property(nonatomic, readonly, copy) NSString* monogramString;
-// Favicon monogram color. Only available when there is no image.
-@property(nonatomic, readonly, strong) UIColor* textColor;
-// Favicon monogram background color. Only available when there is no image.
-@property(nonatomic, readonly, strong) UIColor* backgroundColor;
-
-+ (instancetype)attributesWithImage:(UIImage*)image;
-+ (instancetype)attributesWithMonogram:(NSString*)monogram
-                             textColor:(UIColor*)textColor
-                       backgroundColor:(UIColor*)backgroundColor;
-
-// Designated initializer. Either |image| or all of |textColor|,
-// |backgroundColor| and |monogram| must be not nil.
-- (instancetype)initWithImage:(UIImage*)image
-                     monogram:(NSString*)monogram
-                    textColor:(UIColor*)textColor
-              backgroundColor:(UIColor*)backgroundColor
-    NS_DESIGNATED_INITIALIZER;
-- (instancetype)initWithImage:(UIImage*)image;
-- (instancetype)initWithMonogram:(NSString*)monogram
-                       textColor:(UIColor*)textColor
-                 backgroundColor:(UIColor*)backgroundColor;
-
-- (instancetype)init NS_UNAVAILABLE;
-@end
-
-#endif  // IOS_CHROME_BROWSER_FAVICON_FAVICON_ATTRIBUTES_H_