Use macros to define pepper interfaces

ppapi/proxy/ppb_file_ref_proxy.h

Index: ppapi/proxy/ppb_file_ref_proxy.h
diff --git a/ppapi/proxy/ppb_file_ref_proxy.h b/ppapi/proxy/ppb_file_ref_proxy.h
index 12413431021142931128cbdf27a34e05c33f4a2e..6133c1ac4acaca787245228fe21597cc2dcf5430 100644
--- a/ppapi/proxy/ppb_file_ref_proxy.h
+++ b/ppapi/proxy/ppb_file_ref_proxy.h
@@ -24,11 +24,9 @@ namespace proxy {
 
 class PPB_FileRef_Proxy : public InterfaceProxy {
  public:
-  PPB_FileRef_Proxy(Dispatcher* dispatcher, const void* target_interface);
+  PPB_FileRef_Proxy(Dispatcher* dispatcher);
   virtual ~PPB_FileRef_Proxy();
 
-  static const Info* GetInfo();
-
   static PP_Resource CreateProxyResource(PP_Resource file_system,
                                          const char* path);
 
@@ -57,6 +55,8 @@ class PPB_FileRef_Proxy : public InterfaceProxy {
   static PP_Resource DeserializeFileRef(
       const PPB_FileRef_CreateInfo& serialized);
 
+  static const InterfaceID kInterfaceID = INTERFACE_ID_PPB_FILE_REF;
+
  private:
   // Message handlers.
   void OnMsgCreate(const ppapi::HostResource& file_system,