html_viewer: Make sure window.internals is set-up correctly in layout-tests.

components/test_runner/web_test_delegate.h

 // Copyright 2013 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.
 
 #ifndef COMPONENTS_TEST_RUNNER_WEB_TEST_DELEGATE_H_
 #define COMPONENTS_TEST_RUNNER_WEB_TEST_DELEGATE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 240 matching lines @@
   // request id |request_id|. The promise is resolved with a result.platform set
   // to |platform|. If |platform| is not empty, result.outcome will be
   // 'accepted', otherwise it will be 'dismissed'.
   virtual void ResolveBeforeInstallPromptPromise(
       int request_id,
       const std::string& platform) = 0;
 
   virtual blink::WebPlugin* CreatePluginPlaceholder(
     blink::WebLocalFrame* frame,
     const blink::WebPluginParams& params) = 0;
+
+  virtual void OnWebTestProxyBaseDestroy(WebTestProxyBase* proxy) = 0;
 };
 
 }  // namespace test_runner
 
 #endif  // COMPONENTS_TEST_RUNNER_WEB_TEST_DELEGATE_H_