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

content/browser/renderer_host/render_widget_host_view_gtk.h

Index: content/browser/renderer_host/render_widget_host_view_gtk.h
diff --git a/content/browser/renderer_host/render_widget_host_view_gtk.h b/content/browser/renderer_host/render_widget_host_view_gtk.h
index 1aa159a12f0ed515fac0638f6a20c8cb32e7e09b..43973f71fa9e6db992ae0e629685d8a3c2476ac3 100644
--- a/content/browser/renderer_host/render_widget_host_view_gtk.h
+++ b/content/browser/renderer_host/render_widget_host_view_gtk.h
@@ -28,7 +28,7 @@ class GtkIMContextWrapper;
 struct NativeWebKeyboardEvent;
 
 #if defined(OS_CHROMEOS)
-namespace views {
+namespace ui {
 class TooltipWindowGtk;
 }
 #else
@@ -269,7 +269,7 @@ class RenderWidgetHostViewGtk : public RenderWidgetHostView,
 
 #if defined(OS_CHROMEOS)
   // Custimized tooltip window.
-  scoped_ptr<views::TooltipWindowGtk> tooltip_window_;
+  scoped_ptr<ui::TooltipWindowGtk> tooltip_window_;
 #endif  // defined(OS_CHROMEOS)
 };