Use macros to define pepper interfaces

ppapi/proxy/ppb_broker_proxy.h

Index: ppapi/proxy/ppb_broker_proxy.h
diff --git a/ppapi/proxy/ppb_broker_proxy.h b/ppapi/proxy/ppb_broker_proxy.h
index e8c34e2a20b29a7b3520951653347edaf865d229..54ff9deb352ac6d00d2987535c82f0b6cb099dae 100644
--- a/ppapi/proxy/ppb_broker_proxy.h
+++ b/ppapi/proxy/ppb_broker_proxy.h
@@ -22,20 +22,16 @@ namespace proxy {
 
 class PPB_Broker_Proxy : public InterfaceProxy {
  public:
-  PPB_Broker_Proxy(Dispatcher* dispatcher, const void* target_interface);
+  PPB_Broker_Proxy(Dispatcher* dispatcher);
   virtual ~PPB_Broker_Proxy();
 
-  static const Info* GetInfo();
-
   static PP_Resource CreateProxyResource(PP_Instance instance);
 
-  const PPB_BrokerTrusted* ppb_broker_target() const {
-    return static_cast<const PPB_BrokerTrusted*>(target_interface());
-  }
-
   // InterfaceProxy implementation.
   virtual bool OnMessageReceived(const IPC::Message& msg);
 
+  static const InterfaceID kInterfaceID = INTERFACE_ID_PPB_BROKER;
+
  private:
   // Message handlers.
   void OnMsgCreate(PP_Instance instance, ppapi::HostResource* result_resource);