[iOS Clean] Added JavaScript dialog support.

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 9b8f4ed7780d27f6d3cc03c39a693d3639a13bba..fef3fddfde4291fdc7852e163f312f5a08823ba9 100644
--- a/ios/clean/chrome/browser/ui/web_contents/web_coordinator.mm
+++ b/ios/clean/chrome/browser/ui/web_contents/web_coordinator.mm
@@ -9,6 +9,7 @@
 #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/dialogs/java_script_dialogs/java_script_dialog_overlay_presenter.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/web_contents/web_contents_mediator.h"
@@ -112,6 +113,13 @@ - (void)openContextMenuImage:(ContextMenuContext*)context {
 
 #pragma mark - CRWWebStateDelegate
 
+- (web::JavaScriptDialogPresenter*)javaScriptDialogPresenterForWebState:
+    (web::WebState*)webState {
+  JavaScriptDialogOverlayPresenter::CreateForWebState(self.webState,
+                                                      self.overlayService);
+  return JavaScriptDialogOverlayPresenter::FromWebState(webState);
+}
+
 - (BOOL)webState:(web::WebState*)webState
     handleContextMenu:(const web::ContextMenuParams&)params {
   ContextMenuContextImpl* context =