Remove last uses of InterfaceImpl<> in Sky C++ code

sky/tools/tester/test_harness_impl.cc

 // Copyright 2014 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.
 
 #include "sky/tools/tester/test_harness_impl.h"
 
 #include "sky/tools/tester/test_runner.h"
 
 namespace sky {
 namespace tester {
 
-TestHarnessImpl::TestHarnessImpl(TestRunner* test_runner)
-    : test_runner_(test_runner->GetWeakPtr()) {
+TestHarnessImpl::TestHarnessImpl(TestRunner* test_runner,
+                                 mojo::InterfaceRequest<TestHarness> request)
+    : binding_(this, request.Pass()), test_runner_(test_runner->GetWeakPtr()) {
   // FIXME: This is technically when the V8 context gets created and
   // not when the test is started. An error before we instantiated
   // the V8 context would show up before the #BEGIN line for this test.
   test_runner->OnTestStart();
 }
 
 TestHarnessImpl::~TestHarnessImpl() {
 }
 
 void TestHarnessImpl::OnTestComplete(const mojo::String& test_result,
     const mojo::Array<uint8_t> pixels) {
   if (test_runner_)
     test_runner_->OnTestComplete(test_result, pixels);
 }
 
 void TestHarnessImpl::DispatchInputEvent(mojo::EventPtr event) {
   if (test_runner_)
     test_runner_->client()->DispatchInputEvent(event.Pass());
 }
 
 }  // namespace tester
 }  // namespace sky