Use macros to define pepper interfaces

ppapi/proxy/ppp_class_proxy.cc

Index: ppapi/proxy/ppp_class_proxy.cc
diff --git a/ppapi/proxy/ppp_class_proxy.cc b/ppapi/proxy/ppp_class_proxy.cc
index 8ab109f38b212a39504dd2976413b2bc12323097..9a616f42870930e13a0aebc54305bb8491c28d9e 100644
--- a/ppapi/proxy/ppp_class_proxy.cc
+++ b/ppapi/proxy/ppp_class_proxy.cc
@@ -175,13 +175,18 @@ void* ToUserData(int64 value) {
 // PPP_Class_Proxy -------------------------------------------------------------
 
 PPP_Class_Proxy::PPP_Class_Proxy(Dispatcher* dispatcher)
-    : InterfaceProxy(dispatcher, NULL) {
+    : InterfaceProxy(dispatcher) {
 }
 
 PPP_Class_Proxy::~PPP_Class_Proxy() {
 }
 
 // static
+InterfaceProxy* PPP_Class_Proxy::Create(Dispatcher* dispatcher) {
+  return new PPP_Class_Proxy(dispatcher);
+}
+
+// static
 PP_Var PPP_Class_Proxy::CreateProxiedObject(const PPB_Var_Deprecated* var,
                                             Dispatcher* dispatcher,
                                             PP_Module module_id,