[iOS] Fix Bookmark Open in New Window Crash

We should not dismiss the viewController when opening in a new Window.

Bug: 1119762
Change-Id: I3520dbbaaa4123f564df28e1636aa52e180dd025
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2365978
Commit-Queue: Sebastien Lalancette <seblalancette@chromium.org>
Commit-Queue: Mark Cogan <marq@chromium.org>
Auto-Submit: Sebastien Lalancette <seblalancette@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800136}

ios/chrome/browser/ui/bookmarks/bookmark_home_view_controller.mm

@@ -2236,12 +2236,7 @@ std::vector<GURL> GetUrlsToOpen(const std::vector<const BookmarkNode*>& nodes) {
                 [actionFactory
                     actionToOpenInNewWindowWithURL:node->url()
                                     activityOrigin:WindowActivityBookmarksOrigin
-                                        completion:^{
-                                          [self
-                                              dismissViewControllerAnimated:YES
-                                                                 completion:
-                                                                     nil];
-                                        }]];
+                                        completion:nil]];
       }
 
       [menuElements addObject:[actionFactory actionToCopyURL:node->url()]];