Use targetFrame to decide whether to allow load in static html view.

ios/chrome/browser/ui/static_content/static_html_view_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.
 
 #include "ios/chrome/browser/ui/static_content/static_html_view_controller.h"
 
 #import <WebKit/WebKit.h>
 
 #include <stdlib.h>
 
@@ skipping 189 matching lines @@
 #pragma mark -
 #pragma mark WKNavigationDelegate implementation
 
 - (void)webView:(WKWebView*)webView
     decidePolicyForNavigationAction:(WKNavigationAction*)navigationAction
                     decisionHandler:
                         (void (^)(WKNavigationActionPolicy))decisionHandler {
   decisionHandler(
       [self
           shouldStartLoadWithRequest:navigationAction.request
-                       fromMainFrame:[navigationAction.sourceFrame isMainFrame]]
+                       fromMainFrame:[navigationAction.targetFrame isMainFrame]]
           ? WKNavigationActionPolicyAllow
           : WKNavigationActionPolicyCancel);
 }
 
 #pragma mark -
 #pragma mark CRWContextMenuDelegate implementation
 
 - (BOOL)webView:(WKWebView*)webView
     handleContextMenu:(const web::ContextMenuParams&)params {
   if ([delegate_
@@ skipping 89 matching lines @@
         allowingReadAccessToURL:resourcesRootDirectory_];
   } else {
     NSURL* resourceURL = [self resourceURL];
     [generator_ generateHtml:^(NSString* HTML) {
       [webView loadHTMLString:HTML baseURL:resourceURL];
     }];
   }
 }
 
 @end