[ios] Refactored dialogs suppression.

ios/web/web_state/ui/crw_web_controller.h

Index: ios/web/web_state/ui/crw_web_controller.h
diff --git a/ios/web/web_state/ui/crw_web_controller.h b/ios/web/web_state/ui/crw_web_controller.h
index bf01ed453cf3e5998cf5258fd5152adf31eeb2c4..d0e16601ca9d5f00e112a21838c0e3e3d43726e5 100644
--- a/ios/web/web_state/ui/crw_web_controller.h
+++ b/ios/web/web_state/ui/crw_web_controller.h
@@ -121,6 +121,11 @@ class WebStateImpl;
 // Whether or not content can programmatically display the keyboard.
 @property(nonatomic, assign) BOOL keyboardDisplayRequiresUserAction;
 
+// YES if JavaScript dialogs, HTTP authentication dialogs and window.open
+// calls should be suppressed. Default is NO. When dialog is suppressed
+// |CRWWebDelegate webControllerDidSuppressDialog:| will be called.
+@property(nonatomic, assign) BOOL suppressDialogs;
+
 // Return an image to use as replacement of a missing snapshot.
 + (UIImage*)defaultSnapshotImage;
 
@@ -240,6 +245,8 @@ class WebStateImpl;
 
 // Sets policy for web page dialog handling. Controls dialog suppression and
 // notifying the WebDelegate.
+// TODO(crbug.com/595463): remove this method, once embedder uses
+// |setSuppressDialogs|.
 - (void)setPageDialogOpenPolicy:(web::PageDialogOpenPolicy)policy;
 
 // Records the state (scroll position, form values, whatever can be harvested)