[android_webview] Enable navigation interception for iframes.

content/components/navigation_interception/intercept_navigation_resource_throttle.cc

 // Copyright (c) 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 "content/components/navigation_interception/intercept_navigation_resource_throttle.h"
 
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/child_process_security_policy.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/render_process_host.h"
@@ skipping 76 matching lines @@
 bool InterceptNavigationResourceThrottle::CheckIfShouldIgnoreNavigation(
     const GURL& url) {
   const ResourceRequestInfo* info = ResourceRequestInfo::ForRequest(request_);
   if (!info)
     return false;
 
   int render_process_id, render_view_id;
   if (!info->GetAssociatedRenderView(&render_process_id, &render_view_id))
     return false;
 
-  // This class should only be instantiated for top level frame requests.
-  DCHECK(info->IsMainFrame());
-
   ShouldIgnoreCallbackParams params;
   params.render_process_id = render_process_id;
   params.render_view_id = render_view_id;
   params.url = url;
   params.referrer = Referrer(GURL(request_->referrer()),
                              info->GetReferrerPolicy());
   params.has_user_gesture = info->HasUserGesture();
   params.is_post = request_->method() == "POST";
 
   BrowserThread::PostTask(
@@ skipping 17 matching lines @@
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 
   if (should_ignore_navigation) {
     controller()->CancelAndIgnore();
   } else {
     controller()->Resume();
   }
 }
 
 }  // namespace content