Move AccessibilityDelegate ownership to ash::WmShell

ash/mus/accessibility_delegate_mus.cc

Index: ash/mus/accessibility_delegate_mus.cc
diff --git a/ash/mus/accessibility_delegate_mus.cc b/ash/mus/accessibility_delegate_mus.cc
new file mode 100644
index 0000000000000000000000000000000000000000..a3e66dc8b5625ab6c656d787a55c7062e46e327d
--- /dev/null
+++ b/ash/mus/accessibility_delegate_mus.cc
@@ -0,0 +1,28 @@
+// 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 "ash/mus/accessibility_delegate_mus.h"
+
+#include "services/shell/public/cpp/connector.h"
+
+namespace ash {
+
+AccessibilityDelegateMus::AccessibilityDelegateMus(shell::Connector* connector)
+    : connector_(connector) {}
+
+AccessibilityDelegateMus::~AccessibilityDelegateMus() {}
+
+ui::mojom::AccessibilityManager*
+AccessibilityDelegateMus::GetAccessibilityManager() {
+  if (!accessibility_manager_ptr_.is_bound())
+    connector_->ConnectToInterface("mojo:ui", &accessibility_manager_ptr_);
+  return accessibility_manager_ptr_.get();
+}
+
+void AccessibilityDelegateMus::ToggleHighContrast() {
+  DefaultAccessibilityDelegate::ToggleHighContrast();
+  GetAccessibilityManager()->SetHighContrastMode(IsHighContrastEnabled());
+}
+
+}  // namespace ash