views: Move widget/ directory to ui/views.

ui/views/widget/root_view.h

Index: ui/views/widget/root_view.h
diff --git a/views/widget/root_view.h b/ui/views/widget/root_view.h
similarity index 98%
rename from views/widget/root_view.h
rename to ui/views/widget/root_view.h
index 1a17d3887706442eca12dc1c51b434644b1f4b1f..d5df829369292bc71146a58e6e1e91d29808e9ec 100644
--- a/views/widget/root_view.h
+++ b/ui/views/widget/root_view.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef VIEWS_WIDGET_ROOT_VIEW_H_
-#define VIEWS_WIDGET_ROOT_VIEW_H_
+#ifndef UI_VIEWS_WIDGET_ROOT_VIEW_H_
+#define UI_VIEWS_WIDGET_ROOT_VIEW_H_
 #pragma once
 
 #include <string>
@@ -204,4 +204,4 @@ class VIEWS_EXPORT RootView : public View, public FocusTraversable {
 }  // namespace internal
 }  // namespace views
 
-#endif  // VIEWS_WIDGET_ROOT_VIEW_H_
+#endif  // UI_VIEWS_WIDGET_ROOT_VIEW_H_