Revive PasswordManager.OsPasswordStatus histogram.

chrome/browser/password_manager/password_manager_util_win.cc

Index: chrome/browser/password_manager/password_manager_util_win.cc
diff --git a/chrome/browser/password_manager/password_manager_util_win.cc b/chrome/browser/password_manager/password_manager_util_win.cc
index 4eef9b45e4e0c3dfd2ce6622831041202f3551b9..30777f58f493d7e2e5c3a48ee33b44eff5f7a6eb 100644
--- a/chrome/browser/password_manager/password_manager_util_win.cc
+++ b/chrome/browser/password_manager/password_manager_util_win.cc
@@ -129,7 +129,10 @@ OsPasswordStatus GetOsPasswordStatus() {
     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;
     }