[iOS Clean] Removed old overlay implementation.

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/clean/chrome/browser/ui/overlay_service/browser_coordinator+overlay_support.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>
+@interface SettingsCoordinator ()<SettingsNavigationControllerDelegate> {
+  // Backing object for property of same name (in OverlaySupport category).
+  OverlayQueue* _overlayQueue;
+}
 @property(nonatomic, strong) SettingsNavigationController* viewController;
 @end
 
 @implementation SettingsCoordinator
 @synthesize viewController = _viewController;
 
 #pragma mark - BrowserCoordinator
 
 - (void)start {
   self.viewController = [SettingsNavigationController
       newSettingsMainControllerWithMainBrowserState:self.browser
                                                         ->browser_state()
                                            delegate:self];
   [super start];
 }
 
+- (void)stop {
+  [super stop];
+  [self overlayWasStopped];
+}
+
 #pragma mark - SettingsNavigationControllerDelegate
 
 - (void)closeSettingsAndOpenUrl:(OpenUrlCommand*)command {
   // Placeholder implementation to conform to the delegate protocol;
   // for now this just closes the settings without opening a URL.
   [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 {
   [static_cast<id>(self.browser->dispatcher()) closeSettings];
 }
 
 @end
+
+@implementation SettingsCoordinator (OverlaySupport)
+
+- (BOOL)supportsOverlaying {
+  return YES;
+}
+
+- (void)setOverlayQueue:(OverlayQueue*)overlayQueue {
+  _overlayQueue = overlayQueue;
+}
+
+- (OverlayQueue*)overlayQueue {
+  return _overlayQueue;
+}
+
+@end