Remove requirement that mojo::Environment be instantiated.

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/application/application_impl_base.h"
-#include "mojo/public/cpp/environment/environment.h"
 #include "mojo/public/cpp/utility/run_loop.h"
 
 namespace mojo {
 namespace {
 bool g_running = false;
 }  // namespace
 
 // static
 void ApplicationImplBase::Terminate() {
   RunLoop::current()->Quit();
 }
 
 ApplicationRunner::ApplicationRunner(
     std::unique_ptr<ApplicationDelegate> delegate)
     : delegate_(std::move(delegate)) {}
 
 ApplicationRunner::~ApplicationRunner() {
   assert(!delegate_);
 }
 
 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_.get(),
                         InterfaceRequest<Application>(MakeScopedHandle(
                             MessagePipeHandle(app_request_handle))));
     loop.Run();
   }
 
   delegate_.reset();
 
   g_running = false;
 
   return MOJO_RESULT_OK;
 }
 
 }  // namespace mojo