Revive PasswordManager.OsPasswordStatus histogram.

chrome/browser/password_manager/password_manager_util_win.cc

 // Copyright 2013 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.
 
 // windows.h must be first otherwise Win8 SDK breaks.
 #include <windows.h>
 #include <LM.h>
 #include <wincred.h>
 
 // SECURITY_WIN32 must be defined in order to get
@@ skipping 111 matching lines @@
   WCHAR username[CREDUI_MAX_USERNAME_LENGTH+1] = {};
   OsPasswordStatus retVal = PASSWORD_STATUS_UNKNOWN;
 
   if (GetUserNameEx(NameUserPrincipal, username, &username_length)) {
     // If we are on a domain, it is almost certain that the password is not
     // blank, but we do not actively check any further than this to avoid any
     // failed login attempts hitting the domain controller.
     retVal = PASSWORD_STATUS_WIN_DOMAIN;
   } else {
     username_length = CREDUI_MAX_USERNAME_LENGTH;
-    if (GetUserName(username, &username_length)) {
+    // CheckBlankPassword() isn't safe to call on before Windows 7.
+    // http://crbug.com/345916
+    if (base::win::GetVersion() >= base::win::VERSION_WIN7 &&
+        GetUserName(username, &username_length)) {
       retVal = CheckBlankPassword(username) ? PASSWORD_STATUS_BLANK :
           PASSWORD_STATUS_NONBLANK;
     }
   }
 
   return retVal;
 }
 
 bool AuthenticateUser(gfx::NativeWindow window) {
   bool retval = false;
@@ skipping 92 matching lines @@
         }
       }
       SecureZeroMemory(password, sizeof(password));
     }
   } while (credErr == NO_ERROR &&
            (retval == false && tries < kMaxPasswordRetries));
   return retval;
 }
 
 }  // namespace password_manager_util