[iOS Clean] Removed old overlay implementation.

ios/clean/chrome/browser/ui/web_contents/web_coordinator.mm

Index: ios/clean/chrome/browser/ui/web_contents/web_coordinator.mm
diff --git a/ios/clean/chrome/browser/ui/web_contents/web_coordinator.mm b/ios/clean/chrome/browser/ui/web_contents/web_coordinator.mm
index 2ff4c03b9123cf27368ded9d6dcd1c1a0dfd06f7..9b8f4ed7780d27f6d3cc03c39a693d3639a13bba 100644
--- a/ios/clean/chrome/browser/ui/web_contents/web_coordinator.mm
+++ b/ios/clean/chrome/browser/ui/web_contents/web_coordinator.mm
@@ -9,8 +9,8 @@
 #import "ios/clean/chrome/browser/ui/commands/context_menu_commands.h"
 #import "ios/clean/chrome/browser/ui/context_menu/context_menu_context_impl.h"
 #import "ios/clean/chrome/browser/ui/context_menu/web_context_menu_coordinator.h"
+#import "ios/clean/chrome/browser/ui/overlay_service/browser_coordinator+overlay_support.h"
 #import "ios/clean/chrome/browser/ui/overlay_service/overlay_service.h"
-#import "ios/clean/chrome/browser/ui/overlay_service/overlay_service_factory.h"
 #import "ios/clean/chrome/browser/ui/web_contents/web_contents_mediator.h"
 #import "ios/clean/chrome/browser/ui/web_contents/web_contents_view_controller.h"
 #import "ios/shared/chrome/browser/ui/browser_list/browser.h"
@@ -59,17 +59,13 @@ - (void)start {
   self.mediator.webStateList = &self.browser->web_state_list();
   [super start];
   // Notify the OverlayService that this coordinator is displaying |webState|.
-  OverlayServiceFactory::GetInstance()
-      ->GetForBrowserState(self.browser->browser_state())
-      ->SetWebStateParentCoordinator(self, self.webState);
+  self.overlayService->SetWebStateParentCoordinator(self, self.webState);
 }
 
 - (void)stop {
   // Notify the OverlayService that this coordinator is no longer displaying
   // |webState|.
-  OverlayServiceFactory::GetInstance()
-      ->GetForBrowserState(self.browser->browser_state())
-      ->SetWebStateParentCoordinator(nil, self.webState);
+  self.overlayService->SetWebStateParentCoordinator(nil, self.webState);
   [super stop];
   [self.mediator disconnect];
 }