views: Move widget/ directory to ui/views.

ui/views/widget/drop_target_gtk.h

Index: ui/views/widget/drop_target_gtk.h
diff --git a/views/widget/drop_target_gtk.h b/ui/views/widget/drop_target_gtk.h
similarity index 95%
rename from views/widget/drop_target_gtk.h
rename to ui/views/widget/drop_target_gtk.h
index daa08f2e523ddce5b2111bac426f48a7c924cc3b..bf324afda6358d4e053d81046c1ab5823f453bce 100644
--- a/views/widget/drop_target_gtk.h
+++ b/ui/views/widget/drop_target_gtk.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_DROP_TARGET_GTK_H_
-#define VIEWS_WIDGET_DROP_TARGET_GTK_H_
+#ifndef UI_VIEWS_WIDGET_DROP_TARGET_GTK_H_
+#define UI_VIEWS_WIDGET_DROP_TARGET_GTK_H_
 #pragma once
 
 #include <gtk/gtk.h>
@@ -11,7 +11,7 @@
 
 #include "base/memory/scoped_ptr.h"
 #include "ui/base/dragdrop/os_exchange_data.h"
-#include "views/widget/drop_helper.h"
+#include "ui/views/widget/drop_helper.h"
 
 namespace ui {
 class OSExchangeDataProviderGtk;
@@ -117,4 +117,4 @@ class DropTargetGtk {
 
 }  // namespace views
 
-#endif  // VIEWS_WIDGET_DROP_TARGET_GTK_H_
+#endif  // UI_VIEWS_WIDGET_DROP_TARGET_GTK_H_