Stop PassKitCoordinator in clearPresentedStateWithCompletion:dismissOmnibox:

This should dismiss ‘Add to Apple Wallet’ dialog as intended by BVC.

Bug: 810379
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: Id4cb59c20adb0730808ff47492653468f2a12d18
Reviewed-on: https://chromium-review.googlesource.com/1241934
Commit-Queue: Kurt Horimoto <kkhorimoto@chromium.org>
Reviewed-by: Kurt Horimoto <kkhorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593793}

ios/chrome/browser/ui/browser_view_controller.mm

@@ -1583,6 +1583,7 @@ applicationCommandEndpoint:(id<ApplicationCommands>)applicationCommandEndpoint {
   _printController = nil;
   [self.dispatcher dismissPopupMenuAnimated:NO];
   [_contextMenuCoordinator stop];
+  [_passKitCoordinator stop];
   [self dismissRateThisAppDialog];
 
   if (self.presentedViewController) {