Make ApplicationRunner's ctor's ApplicationDelegate* argument an std::unique_ptr instead.

mojo/public/cpp/application/lib/application_runner.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 "mojo/public/cpp/application/application_runner.h"
 
 #include "mojo/public/cpp/application/application_delegate.h"
 #include "mojo/public/cpp/application/application_impl.h"
 #include "mojo/public/cpp/environment/environment.h"
 #include "mojo/public/cpp/environment/logging.h"
 #include "mojo/public/cpp/utility/run_loop.h"
 
 namespace mojo {
 namespace {
 bool g_running = false;
 }  // namespace
 
 // static
 void ApplicationImpl::Terminate() {
   RunLoop::current()->Quit();
 }
 
-ApplicationRunner::ApplicationRunner(ApplicationDelegate* delegate)
-    : delegate_(delegate) {}
+ApplicationRunner::ApplicationRunner(
+    std::unique_ptr<ApplicationDelegate> delegate)
+    : delegate_(std::move(delegate)) {}
 
 ApplicationRunner::~ApplicationRunner() {
   assert(!delegate_);
 }
 
 // static
 void ApplicationRunner::SetDefaultLogger(const MojoLogger* logger) {
   MOJO_DCHECK(g_running);
   Environment::SetDefaultLogger(logger);
 }
 
 // static
 const MojoLogger* ApplicationRunner::GetDefaultLogger() {
   MOJO_DCHECK(g_running);
   return Environment::GetDefaultLogger();
 }
 
 MojoResult ApplicationRunner::Run(MojoHandle app_request_handle) {
   MOJO_DCHECK(!g_running)
       << "Another ApplicationRunner::Run() is already running!";
 
   g_running = true;
   Environment env;
   {
     RunLoop loop;
-    ApplicationImpl app(delegate_, MakeRequest<Application>(MakeScopedHandle(
-                                       MessagePipeHandle(app_request_handle))));
+    ApplicationImpl app(delegate_.get(),
+                        MakeRequest<Application>(MakeScopedHandle(
+                            MessagePipeHandle(app_request_handle))));
     loop.Run();
   }
 
-  delete delegate_;
-  delegate_ = nullptr;
+  delegate_.reset();
 
   g_running = false;
 
   return MOJO_RESULT_OK;
 }
 
 }  // namespace mojo