Remove unnecessary attempts at memory cleaning

net/base/auth.h

Index: net/base/auth.h
diff --git a/net/base/auth.h b/net/base/auth.h
index 5f97acbf87f62b7d753ead6de4e5866a0b3f12a6..9db8447f94b75dd57e416b23f088428264bdbb4d 100644
--- a/net/base/auth.h
+++ b/net/base/auth.h
@@ -59,10 +59,6 @@ class NET_EXPORT AuthCredentials {
   // Returns true if all credentials are empty.
   bool Empty() const;
 
-  // Overwrites the password memory to prevent it from being read if
-  // it's paged out to disk.
-  void Zap();
-
   const base::string16& username() const { return username_; }
   const base::string16& password() const { return password_; }