Automatically call OnNativeThemeChanged when a widget is added to a hierarchy

ui/views/controls/label.h

Index: ui/views/controls/label.h
diff --git a/ui/views/controls/label.h b/ui/views/controls/label.h
index 17251f3528b89f080d6d62ef076504d886c84649..d382d008be1f95a8dd613bcc78e45a188805b3de 100644
--- a/ui/views/controls/label.h
+++ b/ui/views/controls/label.h
@@ -244,9 +244,6 @@ class VIEWS_EXPORT Label : public View {
                                  gfx::Rect* text_bounds,
                                  int* flags) const;
 
-  // Updates any colors that have not been explicitly set from the theme.
-  void UpdateColorsFromTheme(const ui::NativeTheme* theme);
-
   // Resets |cached_heights_| and |cached_heights_cursor_| and mark
   // |text_size_valid_| as false.
   void ResetCachedSize();