Use the correct Resource constructor for PPB_Font_Shared in the plugin process.

ppapi/shared_impl/private/ppb_font_shared.h

 // Copyright (c) 2011 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_PRIVATE_PPB_FONT_SHARED_H_
 #define PPAPI_SHARED_IMPL_PRIVATE_PPB_FONT_SHARED_H_
 #pragma once
 
 #include <string>
 
@@ skipping 41 matching lines @@
                              uint32_t color,
                              const PP_Rect* clip,
                              PP_Bool image_data_is_opaque) OVERRIDE;
   virtual int32_t MeasureText(const PP_TextRun_Dev* text) OVERRIDE;
   virtual uint32_t CharacterOffsetForPixel(const PP_TextRun_Dev* text,
                                            int32_t pixel_position) OVERRIDE;
   virtual int32_t PixelOffsetForCharacter(const PP_TextRun_Dev* text,
                                           uint32_t char_offset) OVERRIDE;
 
  private:
-  PPB_Font_Shared(PP_Instance instance, const PP_FontDescription_Dev& desc,
+  struct InitAsImpl {};
+  struct InitAsProxy {};
+
+  // The dummy arguments control which version of Resource's constructor is
+  // called for this base class.
+  PPB_Font_Shared(const InitAsImpl&,
+                  PP_Instance instance,
+                  const PP_FontDescription_Dev& desc,
+                  const ::ppapi::Preferences& prefs);
+  PPB_Font_Shared(const InitAsProxy&,
+                  PP_Instance instance,
+                  const PP_FontDescription_Dev& desc,
+                  const ::ppapi::Preferences& prefs);
+
+  void Initialize(const PP_FontDescription_Dev& desc,
                   const ::ppapi::Preferences& prefs);
 
   scoped_ptr< ::ppapi::WebKitForwarding::Font> font_impl_;
 
   DISALLOW_COPY_AND_ASSIGN(PPB_Font_Shared);
 };
 
 }  // namespace ppapi
 
 #endif  // PPAPI_SHARED_IMPL_PRIVATE_PPB_FONT_SHARED_H_