[iOS Clean] Removed old overlay implementation.

ios/clean/chrome/browser/ui/settings/settings_coordinator.mm

Index: ios/clean/chrome/browser/ui/settings/settings_coordinator.mm
diff --git a/ios/clean/chrome/browser/ui/settings/settings_coordinator.mm b/ios/clean/chrome/browser/ui/settings/settings_coordinator.mm
index 3fcc5f910bbdc2b841001ca487f5888346fcfa7d..ffb02557bd4604324633d05acfd57f0099ec615f 100644
--- a/ios/clean/chrome/browser/ui/settings/settings_coordinator.mm
+++ b/ios/clean/chrome/browser/ui/settings/settings_coordinator.mm
@@ -6,6 +6,7 @@
 
 #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"
@@ -14,7 +15,10 @@
 #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
 
@@ -31,6 +35,11 @@ - (void)start {
   [super start];
 }
 
+- (void)stop {
+  [super stop];
+  [self overlayWasStopped];
+}
+
 #pragma mark - SettingsNavigationControllerDelegate
 
 - (void)closeSettingsAndOpenUrl:(OpenUrlCommand*)command {
@@ -50,3 +59,19 @@ - (void)closeSettings {
 }
 
 @end
+
+@implementation SettingsCoordinator (OverlaySupport)
+
+- (BOOL)supportsOverlaying {
+  return YES;
+}
+
+- (void)setOverlayQueue:(OverlayQueue*)overlayQueue {
+  _overlayQueue = overlayQueue;
+}
+
+- (OverlayQueue*)overlayQueue {
+  return _overlayQueue;
+}
+
+@end