Revert 64847 - Clang fix.

chrome/browser/extensions/convert_web_app.h

 // Copyright (c) 2010 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 CHROME_BROWSER_EXTENSIONS_CONVERT_WEB_APP_H_
 #define CHROME_BROWSER_EXTENSIONS_CONVERT_WEB_APP_H_
 #pragma once
 
 #include <string>
 
 #include "base/ref_counted.h"
 
 class Extension;
 
 namespace base {
 class Time;
 }
 
 namespace webkit_glue {
-struct WebApplicationInfo;
+class WebApplicationInfo;
 }
 
 // Generates a version number for an extension from a time. The goal is to make
 // use of the version number to communicate some useful information. The
 // returned version has the format:
 // <year>.<month><day>.<upper 16 bits of unix timestamp>.<lower 16 bits>
 std::string ConvertTimeToExtensionVersion(const base::Time& time);
 
 // Wraps the specified web app in an extension. The extension is created
 // unpacked in the system temp dir. Returns a valid extension that the caller
 // should take ownership on success, or NULL and |error| on failure.
 //
 // NOTE: This function does file IO and should not be called on the UI thread.
 // NOTE: The caller takes ownership of the directory at extension->path() on the
 // returned object.
 scoped_refptr<Extension> ConvertWebAppToExtension(
     const webkit_glue::WebApplicationInfo& web_app_info,
     const base::Time& create_time);
 
 #endif  // CHROME_BROWSER_EXTENSIONS_CONVERT_WEB_APP_H_