views/mus: Have explicit ownership of views::WindowManagerConnection.

mash/webtest/webtest.cc

 // Copyright 2016 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 "mash/webtest/webtest.h"
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/string16.h"
@@ skipping 136 matching lines @@
     base::MessageLoop::current()->QuitWhenIdle();
 }
 
 void Webtest::Initialize(shell::Connector* connector,
                          const shell::Identity& identity,
                          uint32_t id) {
   connector_ = connector;
   tracing_.Initialize(connector, identity.name());
 
   aura_init_.reset(new views::AuraInit(connector, "views_mus_resources.pak"));
-  views::WindowManagerConnection::Create(connector, identity);
+  views_mus_ = views::WindowManagerConnection::Create(connector, identity);
 }
 
 bool Webtest::AcceptConnection(shell::Connection* connection) {
   connection->AddInterface<mojom::Launchable>(this);
   return true;
 }
 
 void Webtest::Launch(uint32_t what, mojom::LaunchMode how) {
   bool reuse = how == mojom::LaunchMode::REUSE ||
                how == mojom::LaunchMode::DEFAULT;
@@ skipping 17 matching lines @@
   AddWindow(window);
 }
 
 void Webtest::Create(shell::Connection* connection,
                      mojom::LaunchableRequest request) {
   bindings_.AddBinding(this, std::move(request));
 }
 
 }  // namespace webtest
 }  // namespace mash