explicitly delete our c++ window on quit

src/views/mac/SkSampleNSView.mm

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #import "SkSampleNSView.h"
 #include "SampleApp.h"
 #include <crt_externs.h>
 @implementation SkSampleNSView
 
 - (id)initWithDefaults {
     if ((self = [super initWithDefaults])) {
         fWind = new SampleWindow(self, *_NSGetArgc(), *_NSGetArgv(), NULL);
     }
     return self;
 }
 
-- (void)dealloc {
-    delete fWind;
-    [super dealloc];
-}
-
 - (void)swipeWithEvent:(NSEvent *)event {
     CGFloat x = [event deltaX];
     if (x < 0)
         ((SampleWindow*)fWind)->previousSample();
     else if (x > 0)
         ((SampleWindow*)fWind)->nextSample();
     else
         ((SampleWindow*)fWind)->showOverview();
 }
 
 @end