Enable <webview>.executeScript outside of Apps and Extensions [1]

extensions/renderer/web_ui_injection_host.cc

 // Copyright 2015 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 "extensions/renderer/web_ui_injection_host.h"
 
 WebUIInjectionHost::WebUIInjectionHost(const HostID& host_id)
   : InjectionHost(host_id),
     url_(host_id.id()) {
 }
 
 WebUIInjectionHost::~WebUIInjectionHost() {
 }
 
+// static
+scoped_ptr<const InjectionHost> WebUIInjectionHost::Create(
+    const HostID& host_id) {
+  return scoped_ptr<const InjectionHost>(new WebUIInjectionHost(host_id));
+}
 
 std::string WebUIInjectionHost::GetContentSecurityPolicy() const {
   return std::string();
 }
 
 const GURL& WebUIInjectionHost::url() const {
   return url_;
 }
 
 const std::string& WebUIInjectionHost::name() const {
   return id().id();
 }
 
 extensions::PermissionsData::AccessType WebUIInjectionHost::CanExecuteOnFrame(
       const GURL& document_url,
       const GURL& top_frame_url,
       int tab_id,
       bool is_declarative) const {
   // Content scripts are allowed to inject on webviews created by WebUI.
   return extensions::PermissionsData::AccessType::ACCESS_ALLOWED;
 }
 
 bool WebUIInjectionHost::ShouldNotifyBrowserOfInjection() const {
   // We don't notify browser of any injection made from WebUI, since the
   // decision for injection is made in the render.
   return false;
 }