[ios clean] Creates ToolbarWebState Mediator

ios/clean/chrome/browser/ui/toolbar/toolbar_view_controller.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.
 
 // ======                        New Architecture                         =====
 // =         This code is only used in the new iOS Chrome architecture.       =
 // ============================================================================
 
 #import "ios/clean/chrome/browser/ui/toolbar/toolbar_view_controller.h"
 
@@ skipping 153 matching lines @@
       previousTraitCollection.horizontalSizeClass) {
     for (UIView* view in self.stackView.arrangedSubviews) {
       if ([view isKindOfClass:[ToolbarButton class]]) {
         ToolbarButton* button = base::mac::ObjCCastStrict<ToolbarButton>(view);
         [button updateHiddenInCurrentSizeClass];
       }
     }
   }
 }
 
-#pragma mark - Public API
+#pragma mark - ToolbarWebStateConsumer
 
 - (void)setCurrentPageText:(NSString*)text {
   self.omnibox.text = text;
 }
 
 #pragma mark - ZoomTransitionDelegate
 
 - (CGRect)rectForZoomWithKey:(NSObject*)key inView:(UIView*)view {
   return [view convertRect:self.toolsMenuButton.bounds
                   fromView:self.toolsMenuButton];
@@ skipping 19 matching lines @@
 - (void)updateAllButtonsVisibility {
   for (UIView* view in self.stackView.arrangedSubviews) {
     if ([view isKindOfClass:[ToolbarButton class]]) {
       ToolbarButton* button = base::mac::ObjCCastStrict<ToolbarButton>(view);
       [button setHiddenForCurrentStateAndSizeClass];
     }
   }
 }
 
 @end