Mojo: Replace RemotePtr with InterfacePtr and InterfaceImpl

mojo/public/interfaces/bindings/tests/math_calculator.mojom

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 module math {
 
-[Peer=CalculatorUI]
 interface Calculator {
-  Clear@0();
-  Add@1(double value @0);
-  Multiply@2(double value @0);
+  SetUI@0(CalculatorUI ui@0);
+  Clear@1();
+  Add@2(double value @0);
+  Multiply@3(double value @0);
 };
 
-[Peer=Calculator]
 interface CalculatorUI {
   Output@0(double value @0);
 };
 
 }