[iOS] Add experimental new keyboard accessory view.

ios/chrome/browser/ui/fancy_ui/tinted_button.h

Index: ios/chrome/browser/ui/fancy_ui/tinted_button.h
diff --git a/ios/chrome/browser/ui/fancy_ui/tinted_button.h b/ios/chrome/browser/ui/fancy_ui/tinted_button.h
deleted file mode 100644
index dc05761432f6c4c5cb97bcc7451e5d66880c1c7a..0000000000000000000000000000000000000000
--- a/ios/chrome/browser/ui/fancy_ui/tinted_button.h
+++ /dev/null
@@ -1,23 +0,0 @@
-// 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_FANCY_UI_TINTED_BUTTON_H_
-#define IOS_CHROME_BROWSER_UI_FANCY_UI_TINTED_BUTTON_H_
-
-#import <UIKit/UIKit.h>
-
-// Subclass of UIButton whose tint color changes depending on its state.
-// If the value is not specified for a state, uses the UIControlStateNormal
-// value. If the UIControlStateNormal value is not set, defaults to the system's
-// value.
-@interface TintedButton : UIButton
-
-// Sets the tint color of a button to use for the specified state.
-// Currently only supports |UIControlStateNormal| and
-// |UIControlStateHighlighted|.
-- (void)setTintColor:(UIColor*)color forState:(UIControlState)state;
-
-@end
-
-#endif  // IOS_CHROME_BROWSER_UI_FANCY_UI_TINTED_BUTTON_H_