Give StatusTrayStateChangerProxy a virtual destructor.

chrome/browser/ui/views/status_icons/status_tray_win.h

Index: chrome/browser/ui/views/status_icons/status_tray_win.h
diff --git a/chrome/browser/ui/views/status_icons/status_tray_win.h b/chrome/browser/ui/views/status_icons/status_tray_win.h
index 08a05e85c6b18062eea12770b715b520347ae2c6..2d1dfb9ca87afc66742dd09ce6e2b6e0c448da63 100644
--- a/chrome/browser/ui/views/status_icons/status_tray_win.h
+++ b/chrome/browser/ui/views/status_icons/status_tray_win.h
@@ -18,6 +18,8 @@ class StatusIconWin;
 // a task to a worker thread each time EnqueueChange is called.
 class StatusTrayStateChangerProxy {
  public:
+  virtual ~StatusTrayStateChangerProxy() {}
+
   // Called by StatusTrayWin to request upgraded visibility on the icon
   // represented by the |icon_id|, |window| pair.
   virtual void EnqueueChange(UINT icon_id, HWND window) = 0;