Mojo C++ bindings: Generate InterfaceHandle<> instead of InterfacePtr<>.

mojo/public/cpp/bindings/tests/binding_unittest.cc

 // Copyright 2015 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.
 
 // Note: This file tests both binding.h (mojo::Binding) and strong_binding.h
 // (mojo::StrongBinding).
 
 #include "mojo/public/cpp/bindings/binding.h"
 #include "mojo/public/cpp/bindings/strong_binding.h"
 #include "mojo/public/cpp/environment/environment.h"
@@ skipping 26 matching lines @@
       : was_deleted_(was_deleted) {}
   ~ServiceImpl() override {
     if (was_deleted_)
       *was_deleted_ = true;
   }
 
  private:
   // sample::Service implementation
   void Frobinate(sample::FooPtr foo,
                  BazOptions options,
-                 sample::PortPtr port,
+                 mojo::InterfaceHandle<sample::Port> port,
                  const FrobinateCallback& callback) override {
     callback.Run(1);
   }
   void GetPort(InterfaceRequest<sample::Port> port) override {}
 
   bool* const was_deleted_;
 
   MOJO_DISALLOW_COPY_AND_ASSIGN(ServiceImpl);
 };
 
@@ skipping 271 matching lines @@
 
 // Tests that StrongBinding::Unbind() compiles.
 TEST_F(BindingTest, StrongBindingUnbindCompile) {
   ServiceImpl impl;
   sample::ServicePtr ptr;
   StrongBinding<sample::Service> binding(&impl, GetProxy(&ptr));
   binding.Unbind();
 }
 
 }  // namespace
-}  // mojo
+}  // namespace mojo