Do all OOLing in the views code. linux_views now builds clean with the clang plugin.

views/controls/menu/menu_separator.h

Index: views/controls/menu/menu_separator.h
diff --git a/views/controls/menu/menu_separator.h b/views/controls/menu/menu_separator.h
index 393b3b2cd741c179923c38b02f06ad162f345aee..7260e169bed41c86fb69d13c7ed71f99b13b6c90 100644
--- a/views/controls/menu/menu_separator.h
+++ b/views/controls/menu/menu_separator.h
@@ -16,8 +16,8 @@ class MenuSeparator : public View {
   MenuSeparator() {}
 
   // View overrides.
-  void OnPaint(gfx::Canvas* canvas);
-  gfx::Size GetPreferredSize();
+  virtual void OnPaint(gfx::Canvas* canvas);
+  virtual gfx::Size GetPreferredSize();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MenuSeparator);