[clean] Use CommandDispatcher to show/close Settings.

ios/clean/chrome/browser/ui/settings/settings_coordinator.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.
 
 #import "ios/clean/chrome/browser/ui/settings/settings_coordinator.h"
 
 #import "ios/chrome/browser/ui/settings/settings_navigation_controller.h"
 #import "ios/clean/chrome/browser/ui/commands/settings_commands.h"
 #import "ios/shared/chrome/browser/coordinator_context/coordinator_context.h"
 #import "ios/shared/chrome/browser/ui/browser_list/browser.h"
+#import "ios/shared/chrome/browser/ui/commands/command_dispatcher.h"
 #import "ios/shared/chrome/browser/ui/coordinators/browser_coordinator+internal.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 @interface SettingsCoordinator ()<SettingsNavigationControllerDelegate>
 @property(nonatomic, strong) SettingsNavigationController* viewController;
 @end
 
 @implementation SettingsCoordinator
-@synthesize settingsCommandHandler = _settingsCommandHandler;
 @synthesize viewController = _viewController;
 
 #pragma mark - BrowserCoordinator
 
 - (void)start {
   self.viewController = [SettingsNavigationController
       newSettingsMainControllerWithMainBrowserState:self.browser
                                                         ->browser_state()
                                 currentBrowserState:self.browser
                                                         ->browser_state()
@@ skipping 19 matching lines @@
   [self closeSettings];
 }
 
 - (void)closeSettingsAndOpenNewIncognitoTab {
   // Placeholder implementation to conform to the delegate protocol;
   // for now this just closes the settings without opening a new tab.
   [self closeSettings];
 }
 
 - (void)closeSettings {
-  [self.settingsCommandHandler closeSettings];
+  [static_cast<id>(self.browser->dispatcher()) closeSettings];
 }
 
 @end