[ios] Don't present Infobar Messages modal if banner is presented

Bug: 1082728
Change-Id: I98c56d8348146e2d09be4ab159fcaaa2fada80f3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2206971Reviewed-by: Sergio Collazos <sczs@chromium.org>
Commit-Queue: Chris Lu <thegreenfrog@chromium.org>
Cr-Commit-Position: refs/heads/master@{#771072}

ios/chrome/browser/ui/badges/badge_view_controller.mm

@@ -128,6 +128,9 @@ const CGFloat kUpdateDisplayedBadgeAnimationDamping = 0.85;
                     animated:NO];
       self.displayedBadge = newButton;
     }
+    // Disable button if banner is being displayed.
+    [self.displayedBadge
+        setEnabled:!(displayedBadgeItem.badgeState & BadgeStatePresented)];
   } else {
     self.displayedBadge = nil;
   }