Move TooltipWindowGtk from views/widget to ui/base/gtk.

ui/base/gtk/tooltip_window_gtk.cc

Index: ui/base/gtk/tooltip_window_gtk.cc
diff --git a/views/widget/tooltip_window_gtk.cc b/ui/base/gtk/tooltip_window_gtk.cc
similarity index 96%
rename from views/widget/tooltip_window_gtk.cc
rename to ui/base/gtk/tooltip_window_gtk.cc
index 444e67ec006c7e27575136a3708e7aed5455099d..bf9a508411e242a3297d3b0dac94441c33597e13 100644
--- a/views/widget/tooltip_window_gtk.cc
+++ b/ui/base/gtk/tooltip_window_gtk.cc
@@ -2,13 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "views/widget/tooltip_window_gtk.h"
+#include "ui/base/gtk/tooltip_window_gtk.h"
 
 #include <gtk/gtk.h>
 
 #include "base/utf_string_conversions.h"
 
-namespace views {
+namespace ui {
 
 TooltipWindowGtk::TooltipWindowGtk(GtkWidget* widget)
     : host_(widget),
@@ -92,4 +92,4 @@ void TooltipWindowGtk::OnStyleSet(GtkWidget* widget,
   gtk_widget_queue_draw(widget);
 }
 
-}  // namespace views
+}  // namespace ui