[iOS][Alert] Don't delay touches in actions

Bug: 999957
Change-Id: I04645a21455d0ed7aeb6dc014f68b234a09a3793
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1787500
Auto-Submit: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Commit-Queue: Kurt Horimoto <kkhorimoto@chromium.org>
Reviewed-by: Kurt Horimoto <kkhorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693763}

ios/chrome/browser/ui/alert_view_controller/alert_view_controller.mm

@@ -206,6 +206,7 @@ constexpr NSUInteger kUIViewAnimationCurveToOptionsShift = 16;
   ]];
 
   UIScrollView* scrollView = [[UIScrollView alloc] init];
+  scrollView.delaysContentTouches = NO;
   scrollView.showsVerticalScrollIndicator = YES;
   scrollView.showsHorizontalScrollIndicator = NO;
   scrollView.translatesAutoresizingMaskIntoConstraints = NO;