Use macros to define pepper interfaces

ppapi/proxy/ppb_context_3d_proxy.h

Index: ppapi/proxy/ppb_context_3d_proxy.h
diff --git a/ppapi/proxy/ppb_context_3d_proxy.h b/ppapi/proxy/ppb_context_3d_proxy.h
index 8a49efe5949e8b9e39109c28188b5c6317af24e3..4eb4c6698ec480fb68b74f77d87a6c5e0f6fc3cc 100644
--- a/ppapi/proxy/ppb_context_3d_proxy.h
+++ b/ppapi/proxy/ppb_context_3d_proxy.h
@@ -94,12 +94,9 @@ class Context3D : public Resource, public thunk::PPB_Context3D_API {
 
 class PPB_Context3D_Proxy : public InterfaceProxy {
  public:
-  PPB_Context3D_Proxy(Dispatcher* dispatcher, const void* target_interface);
+  PPB_Context3D_Proxy(Dispatcher* dispatcher);
   virtual ~PPB_Context3D_Proxy();
 
-  static const Info* GetInfo();
-  static const Info* GetTextureMappingInfo();
-
   static PP_Resource Create(PP_Instance instance,
                             PP_Config3D_Dev config,
                             PP_Resource share_context,
@@ -108,6 +105,8 @@ class PPB_Context3D_Proxy : public InterfaceProxy {
   // InterfaceProxy implementation.
   virtual bool OnMessageReceived(const IPC::Message& msg);
 
+  static const InterfaceID kInterfaceID = INTERFACE_ID_PPB_CONTEXT_3D;
+
  private:
   void OnMsgCreate(PP_Instance instance,
                    PP_Config3D_Dev config,