[Mac] Use object_destructInstance() if available.

chrome/browser/chrome_browser_application_mac.mm

Index: chrome/browser/chrome_browser_application_mac.mm
diff --git a/chrome/browser/chrome_browser_application_mac.mm b/chrome/browser/chrome_browser_application_mac.mm
index 3ee3dae68ed706525a6da87b4227d937c0644d6b..d407dde98ff9d5227666c69ba3e5485e945b54ec 100644
--- a/chrome/browser/chrome_browser_application_mac.mm
+++ b/chrome/browser/chrome_browser_application_mac.mm
@@ -8,7 +8,6 @@
 #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"
@@ -201,15 +200,9 @@ BOOL SwizzleNSExceptionInit() {
 @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 {