[Mac] Temporarily stop clearing zombie objects.

chrome/common/mac/objc_zombie.mm

Index: chrome/common/mac/objc_zombie.mm
diff --git a/chrome/common/mac/objc_zombie.mm b/chrome/common/mac/objc_zombie.mm
index 0f01a529d031a914f32a40902f1296e3c45b3401..cd6a31a7279460c7e0dc87baeaba62f07df82e54 100644
--- a/chrome/common/mac/objc_zombie.mm
+++ b/chrome/common/mac/objc_zombie.mm
@@ -116,7 +116,11 @@ void ZombieDealloc(id self, SEL _cmd) {
   // class without C++ destructors or associative references, so it
   // won't hurt anything.
   objc_destructInstance(self);
+  // TODO(shess): Temporarily disable clearing the object to debug
+  // http://crbug.com/154483
+#if 0
   memset(self, '!', size);
+#endif
 
   // If the instance is big enough, make it into a fat zombie and have
   // it remember the old |isa|.  Otherwise make it a regular zombie.