Give the main frame a RenderWidget.

content/public/browser/web_contents_delegate.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/public/browser/web_contents_delegate.h"
 
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/memory/singleton.h"
 #include "content/public/browser/render_view_host.h"
@@ skipping 114 matching lines @@
     blink::WebDragOperationsMask operations_allowed) {
   return true;
 }
 
 bool WebContentsDelegate::OnGoToEntryOffset(int offset) {
   return true;
 }
 
 bool WebContentsDelegate::ShouldCreateWebContents(
     WebContents* web_contents,
-    int route_id,
-    int main_frame_route_id,
+    int32_t route_id,
+    int32_t main_frame_route_id,
+    int32_t main_frame_widget_route_id,
     WindowContainerType window_container_type,
     const std::string& frame_name,
     const GURL& target_url,
     const std::string& partition_id,
     SessionStorageNamespace* session_storage_namespace) {
   return true;
 }
 
 JavaScriptDialogManager* WebContentsDelegate::GetJavaScriptDialogManager(
     WebContents* source) {
@@ skipping 100 matching lines @@
     SecurityStyleExplanations* security_style_explanations) {
   return content::SECURITY_STYLE_UNKNOWN;
 }
 
 void WebContentsDelegate::ShowCertificateViewerInDevTools(
     WebContents* web_contents,
     int cert_id) {
 }
 
 }  // namespace content