mash: Port KeyboardUIMus to mojo:ash; remove sysui.

ash/mus/keyboard_ui_mus.cc

Index: ash/mus/keyboard_ui_mus.cc
diff --git a/ash/sysui/keyboard_ui_mus.cc b/ash/mus/keyboard_ui_mus.cc
similarity index 78%
rename from ash/sysui/keyboard_ui_mus.cc
rename to ash/mus/keyboard_ui_mus.cc
index 6b859a99e0def20029a47e2f62e2c1cc2f972f1d..a2255897dda1cb2c64732ad6a88d128c7655c74c 100644
--- a/ash/sysui/keyboard_ui_mus.cc
+++ b/ash/mus/keyboard_ui_mus.cc
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "ash/sysui/keyboard_ui_mus.h"
+#include "ash/mus/keyboard_ui_mus.h"
 
 #include "ash/common/keyboard/keyboard_ui_observer.h"
 #include "base/memory/ptr_util.h"
@@ -12,9 +12,11 @@ namespace ash {
 
 KeyboardUIMus::KeyboardUIMus(::shell::Connector* connector)
     : is_enabled_(false), observer_binding_(this) {
-  // TODO(sky): should be something like mojo:keyboard, but need mapping.
-  connector->ConnectToInterface("exe:chrome", &keyboard_);
-  keyboard_->AddObserver(observer_binding_.CreateInterfacePtrAndBind());
+  if (connector) {
+    // TODO(sky): should be something like mojo:keyboard, but need mapping.
+    connector->ConnectToInterface("exe:chrome", &keyboard_);
+    keyboard_->AddObserver(observer_binding_.CreateInterfacePtrAndBind());
+  }
 }
 
 KeyboardUIMus::~KeyboardUIMus() {}
@@ -22,7 +24,7 @@ KeyboardUIMus::~KeyboardUIMus() {}
 // static
 std::unique_ptr<KeyboardUI> KeyboardUIMus::Create(
     ::shell::Connector* connector) {
-  return base::WrapUnique(new KeyboardUIMus(connector));
+  return base::MakeUnique<KeyboardUIMus>(connector);
 }
 
 void KeyboardUIMus::Hide() {