Fix up all the easy virtual ... SK_OVERRIDE cases.

tools/iOSShell.h

 /*
  * Copyright 2014 Skia
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef iOSShell_DEFINED
 #define iOSShell_DEFINED
 
 #include "SkWindow.h"
 
 class SkCanvas;
 class SkEvent;
 class SkViewFactory;
 
 class ShellWindow : public SkOSWindow {
 public:
     ShellWindow(void* hwnd, int argc, char** argv);
     virtual ~ShellWindow();
 
 protected:
-    virtual void onSizeChange() SK_OVERRIDE;
+    void onSizeChange() SK_OVERRIDE;
 
     virtual bool onDispatchClick(int x, int y, Click::State, void* owner,
                                  unsigned modi) SK_OVERRIDE;
 
 private:
     typedef SkOSWindow INHERITED;
 };
 
 #endif