Quote WebPreferences in namespace webkit_glue.

ppapi/shared_impl/ppapi_preferences.h

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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.
 
 #ifndef PPAPI_SHARED_IMPL_PPAPI_PREFERENCES_H_
 #define PPAPI_SHARED_IMPL_PPAPI_PREFERENCES_H_
 
 #include "base/string16.h"
 #include "ppapi/shared_impl/ppapi_shared_export.h"
 
+namespace webkit_glue {
 struct WebPreferences;
+}
 
 namespace ppapi {
 
 struct PPAPI_SHARED_EXPORT Preferences {
  public:
   Preferences();
-  explicit Preferences(const WebPreferences& prefs);
+  explicit Preferences(const webkit_glue::WebPreferences& prefs);
   ~Preferences();
 
   string16 standard_font_family;
   string16 fixed_font_family;
   string16 serif_font_family;
   string16 sans_serif_font_family;
   int default_font_size;
   int default_fixed_font_size;
 
   bool is_3d_supported;
 };
 
 }  // namespace ppapi
 
 #endif  // PPAPI_SHARED_IMPL_PPAPI_PREFERENCES_H_