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

ppapi/shared_impl/private/ppb_font_shared.h

Index: ppapi/shared_impl/private/ppb_font_shared.h
diff --git a/ppapi/shared_impl/private/ppb_font_shared.h b/ppapi/shared_impl/private/ppb_font_shared.h
index 3b852bf28e33e48b2f73212cc5d71ce7e3020ede..87152d6319f630c2b97318b8b1b7173861a7eba0 100644
--- a/ppapi/shared_impl/private/ppb_font_shared.h
+++ b/ppapi/shared_impl/private/ppb_font_shared.h
@@ -59,7 +59,21 @@ class PPAPI_SHARED_EXPORT PPB_Font_Shared
                                           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_;