Improve some naming

chrome/browser/ui/libgtk2ui/gtk2_ui.cc

Index: chrome/browser/ui/libgtk2ui/gtk2_ui.cc
diff --git a/chrome/browser/ui/libgtk2ui/gtk2_ui.cc b/chrome/browser/ui/libgtk2ui/gtk2_ui.cc
index 1feebbc86c7c69b95fa71ae125d64188257d3619..50d39ebfdf4912c3580b347f1d0dc70da9982b34 100644
--- a/chrome/browser/ui/libgtk2ui/gtk2_ui.cc
+++ b/chrome/browser/ui/libgtk2ui/gtk2_ui.cc
@@ -663,13 +663,13 @@ ui::SelectFileDialog* Gtk2UI::CreateSelectFileDialog(
   return SelectFileDialogImpl::Create(listener, policy);
 }
 
-void Gtk2UI::AddNativeThemeChangeObserver(
-    views::NativeThemeChangeObserver* observer) {
+void Gtk2UI::AddSystemThemeChangeObserver(
+    views::SystemThemeChangeObserver* observer) {
   theme_change_observers_.AddObserver(observer);
 }
 
-void Gtk2UI::RemoveNativeThemeChangeObserver(
-    views::NativeThemeChangeObserver* observer) {
+void Gtk2UI::RemoveSystemThemeChangeObserver(
+    views::SystemThemeChangeObserver* observer) {
   theme_change_observers_.RemoveObserver(observer);
 }
 
@@ -1378,8 +1378,8 @@ void Gtk2UI::OnStyleSet(GtkWidget* widget, GtkStyle* previous_style) {
   ClearAllThemeData();
   LoadGtkValues();
 
-  FOR_EACH_OBSERVER(views::NativeThemeChangeObserver, theme_change_observers_,
-                    OnNativeThemeChanged());
+  FOR_EACH_OBSERVER(views::SystemThemeChangeObserver, theme_change_observers_,
+                    OnSystemThemeChanged());
 }
 
 }  // namespace libgtk2ui