[Mac] Use object_destructInstance() if available.

chrome/browser/chrome_browser_application_mac.mm

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "chrome/browser/chrome_browser_application_mac.h"
 
 #import "base/logging.h"
 #import "base/mac/scoped_nsexception_enabler.h"
 #import "base/metrics/histogram.h"
 #import "base/memory/scoped_nsobject.h"
-#include "base/sys_info.h"
 #import "base/sys_string_conversions.h"
 #import "chrome/app/breakpad_mac.h"
 #include "chrome/browser/accessibility/browser_accessibility_state.h"
 #import "chrome/browser/app_controller_mac.h"
 #include "chrome/browser/ui/browser_list.h"
 #import "chrome/browser/ui/cocoa/objc_method_swizzle.h"
 #import "chrome/browser/ui/cocoa/objc_zombie.h"
 #include "chrome/browser/ui/tab_contents/tab_contents_wrapper.h"
 #include "content/browser/renderer_host/render_view_host.h"
 
@@ skipping 172 matching lines @@
       @selector(initWithName:reason:userInfo:),
       @selector(chromeInitWithName:reason:userInfo:));
   return YES;
 }
 
 }  // namespace
 
 @implementation BrowserCrApplication
 
 + (void)initialize {
-  // Whitelist releases that are compatible with objc zombies.
-  int32 major_version = 0, minor_version = 0, bugfix_version = 0;
-  base::SysInfo::OperatingSystemVersionNumbers(
-      &major_version, &minor_version, &bugfix_version);
-  if (major_version == 10 && (minor_version == 5 || minor_version == 6)) {
-    // Turn all deallocated Objective-C objects into zombies, keeping
-    // the most recent 10,000 of them on the treadmill.
-    ObjcEvilDoers::ZombieEnable(YES, 10000);
-  }
+  // Turn all deallocated Objective-C objects into zombies, keeping
+  // the most recent 10,000 of them on the treadmill.
+  ObjcEvilDoers::ZombieEnable(YES, 10000);
 }
 
 - init {
   CHECK(SwizzleNSExceptionInit());
   return [super init];
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // HISTORICAL COMMENT (by viettrungluu, from
 // http://codereview.chromium.org/1520006 with mild editing):
@@ skipping 205 matching lines @@
         if (RenderViewHost* rvh = contents->render_view_host()) {
           rvh->EnableRendererAccessibility();
         }
       }
     }
   }
   return [super accessibilitySetValue:value forAttribute:attribute];
 }
 
 @end