[iOS] Add experimental new keyboard accessory view.

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

Index: ios/chrome/browser/ui/fancy_ui/tinted_button.mm
diff --git a/ios/chrome/browser/ui/fancy_ui/tinted_button.mm b/ios/chrome/browser/ui/fancy_ui/tinted_button.mm
deleted file mode 100644
index b0c06a608926d0828dde8e096bd77eeb9b319fb9..0000000000000000000000000000000000000000
--- a/ios/chrome/browser/ui/fancy_ui/tinted_button.mm
+++ /dev/null
@@ -1,67 +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.
-
-#include "ios/chrome/browser/ui/fancy_ui/tinted_button.h"
-
-#if !defined(__has_feature) || !__has_feature(objc_arc)
-#error "This file requires ARC support."
-#endif
-
-@interface TintedButton () {
-  UIColor* normalStateTint_;
-  UIColor* highlightedTint_;
-}
-
-// Makes the button's tint color reflect its current state.
-- (void)updateTint;
-
-@end
-
-@implementation TintedButton
-
-- (void)setTintColor:(UIColor*)color forState:(UIControlState)state {
-  switch (state) {
-    case UIControlStateNormal:
-      normalStateTint_ = [color copy];
-      break;
-    case UIControlStateHighlighted:
-      highlightedTint_ = [color copy];
-      break;
-    default:
-      return;
-  }
-
-  if (normalStateTint_ || highlightedTint_)
-    self.adjustsImageWhenHighlighted = NO;
-  else
-    self.adjustsImageWhenHighlighted = YES;
-  [self updateTint];
-}
-
-#pragma mark - UIControl
-
-- (void)setHighlighted:(BOOL)highlighted {
-  [super setHighlighted:highlighted];
-  [self updateTint];
-}
-
-#pragma mark - Private
-
-- (void)updateTint {
-  UIColor* newTint = nil;
-  switch (self.state) {
-    case UIControlStateNormal:
-      newTint = normalStateTint_;
-      break;
-    case UIControlStateHighlighted:
-      newTint = highlightedTint_;
-      break;
-    default:
-      newTint = normalStateTint_;
-      break;
-  }
-  self.tintColor = newTint;
-}
-
-@end