[ios] Call isInfobarAccepted in modalInfobarButtonWasAccepted

This matches the behavior in bannerInfobarButtonWasPressed

Bug: 1019508
Change-Id: I32c4c43ec39da89067abd0122cd08ba0286b8469
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1894411Reviewed-by: Sergio Collazos <sczs@chromium.org>
Commit-Queue: Chris Lu <thegreenfrog@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711734}

ios/chrome/browser/ui/infobars/coordinators/infobar_coordinator.mm

@@ -290,8 +290,10 @@ const CGFloat kiPadBannerOverlapWithOmnibox = 10.0;
 
 - (void)modalInfobarButtonWasAccepted:(id)sender {
   [self performInfobarAction];
-  [self.badgeDelegate infobarWasAccepted:self.infobarType
-                             forWebState:self.webState];
+  if ([self isInfobarAccepted]) {
+    [self.badgeDelegate infobarWasAccepted:self.infobarType
+                               forWebState:self.webState];
+  }
   [self dismissInfobarModal:sender animated:YES completion:nil];
 }