FocusManagerFactory::Create() should return a unique_ptr.

ui/views/widget/widget.cc

 // Copyright (c) 2012 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 "ui/views/widget/widget.h"
 
 #include "base/auto_reset.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 1051 matching lines @@
   if (root)
     root->PropagateVisibilityNotifications(root, visible);
   for (WidgetObserver& observer : observers_)
     observer.OnWidgetVisibilityChanged(this, visible);
   if (GetCompositor() && root && root->layer())
     root->layer()->SetVisible(visible);
 }
 
 void Widget::OnNativeWidgetCreated(bool desktop_widget) {
   if (is_top_level())
-    focus_manager_.reset(FocusManagerFactory::Create(this, desktop_widget));
+    focus_manager_ = FocusManagerFactory::Create(this, desktop_widget);
 
   native_widget_->InitModalType(widget_delegate_->GetModalType());
 
   for (WidgetObserver& observer : observers_)
     observer.OnWidgetCreated(this);
 }
 
 void Widget::OnNativeWidgetDestroying() {
   // Tell the focus manager (if any) that root_view is being removed
   // in case that the focused view is under this root view.
@@ skipping 482 matching lines @@
 
 ////////////////////////////////////////////////////////////////////////////////
 // internal::NativeWidgetPrivate, NativeWidget implementation:
 
 internal::NativeWidgetPrivate* NativeWidgetPrivate::AsNativeWidgetPrivate() {
   return this;
 }
 
 }  // namespace internal
 }  // namespace views