views: Move widget/ directory to ui/views.

ui/views/widget/drop_target_gtk.cc

Index: ui/views/widget/drop_target_gtk.cc
diff --git a/views/widget/drop_target_gtk.cc b/ui/views/widget/drop_target_gtk.cc
similarity index 98%
rename from views/widget/drop_target_gtk.cc
rename to ui/views/widget/drop_target_gtk.cc
index 8d8e76012ecae4760c5f69dc0db9580fa3dc204d..f5b3102551bb12e1bd421c0a36f5ff8a7731f6cb 100644
--- a/views/widget/drop_target_gtk.cc
+++ b/ui/views/widget/drop_target_gtk.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 "views/widget/drop_target_gtk.h"
+#include "ui/views/widget/drop_target_gtk.h"
 
 #include <algorithm>
 #include <iterator>
@@ -16,8 +16,8 @@
 #include "ui/base/dragdrop/gtk_dnd_util.h"
 #include "ui/base/dragdrop/os_exchange_data_provider_gtk.h"
 #include "ui/gfx/point.h"
-#include "views/widget/root_view.h"
-#include "views/widget/native_widget_gtk.h"
+#include "ui/views/widget/native_widget_gtk.h"
+#include "ui/views/widget/root_view.h"
 
 using ui::OSExchangeData;