Improve some naming

ui/views/linux_ui/linux_ui.h

Index: ui/views/linux_ui/linux_ui.h
diff --git a/ui/views/linux_ui/linux_ui.h b/ui/views/linux_ui/linux_ui.h
index cadc7b72632b51f0806acff2cb51c3e7621dd637..f3f64686fbd87a8d528f59dba9a37ae2381fd365 100644
--- a/ui/views/linux_ui/linux_ui.h
+++ b/ui/views/linux_ui/linux_ui.h
@@ -31,7 +31,7 @@ namespace views {
 class Border;
 class LabelButton;
 class View;
-class NativeThemeChangeObserver;
+class SystemThemeChangeObserver;
 class WindowButtonOrderObserver;
 
 // Adapter class with targets to render like different toolkits. Set by any
@@ -128,10 +128,10 @@ class VIEWS_EXPORT LinuxUI : public ui::LinuxInputMethodContextFactory,
       WindowButtonOrderObserver* observer) = 0;
 
   // Notifies the observer when the native theme changes.
-  virtual void AddNativeThemeChangeObserver(
-      NativeThemeChangeObserver* observer) = 0;
-  virtual void RemoveNativeThemeChangeObserver(
-      NativeThemeChangeObserver* observer) = 0;
+  virtual void AddSystemThemeChangeObserver(
+      SystemThemeChangeObserver* observer) = 0;
+  virtual void RemoveSystemThemeChangeObserver(
+      SystemThemeChangeObserver* observer) = 0;
 
   // Determines whether the user's window manager is Unity.
   virtual bool UnityIsRunning() = 0;