Removed webControllerDidSuppressDialog: callback.

ios/web/web_state/web_state_impl.mm

Index: ios/web/web_state/web_state_impl.mm
diff --git a/ios/web/web_state/web_state_impl.mm b/ios/web/web_state/web_state_impl.mm
index 6946a50efbd2326b0b4c49d3258a5a30057ae5cb..de7c61989f2c6336afcf995444ba9bda990a5c97 100644
--- a/ios/web/web_state/web_state_impl.mm
+++ b/ios/web/web_state/web_state_impl.mm
@@ -211,6 +211,12 @@ void WebStateImpl::OnVisibleSecurityStateChange() {
     observer.DidChangeVisibleSecurityState();
 }
 
+void WebStateImpl::OnDialogSuppressed() {
+  DCHECK(ShouldSuppressDialogs());
+  for (auto& observer : observers_)
+    observer.DidSuppressDialog();
+}
+
 void WebStateImpl::OnRenderProcessGone() {
   for (auto& observer : observers_)
     observer.RenderProcessGone();