Close new child window if its only navigation was opening a Native app.

ios/web/web_state/ui/crw_web_controller.mm

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "ios/web/web_state/ui/crw_web_controller.h"
 
 #import <objc/runtime.h>
 #include <cmath>
 
 #include "base/ios/block_types.h"
@@ skipping 2723 matching lines @@
     // documentURL and navigation URL. This heuristic may have false positives.
     bool shouldAbortLoad = targetFrame ? targetFrame->is_main_frame
                                        : requestURL == mainDocumentURL;
     if (shouldAbortLoad)
       [self abortLoad];
 
     if ([_delegate openExternalURL:requestURL]) {
       // Record the URL so that errors reported following the 'NO' reply can be
       // safely ignored.
       [_openedApplicationURL addObject:request.URL];
-      return NO;
+      if ([self cancellable])
+        [_delegate webPageOrderedClose];
     }
     return NO;
   }
 
   if ([[request HTTPMethod] isEqualToString:@"POST"]) {
     [self cachePOSTDataForRequest:request
                    inSessionEntry:[self currentSessionEntry]];
   }
 
   return YES;
@@ skipping 943 matching lines @@
   if (!_externalRequest || !_externalRequest->window_name)
     return @"";
   return _externalRequest->window_name;
 }
 
 - (void)resetExternalRequest {
   _externalRequest.reset();
 }
 
 @end