Mac: speculative fix for bug 105759 based on the assumption that we have a realm with an empty path.

chrome/browser/password_manager/password_store_mac.cc

Index: chrome/browser/password_manager/password_store_mac.cc
===================================================================
--- chrome/browser/password_manager/password_store_mac.cc	(revision 112034)
+++ chrome/browser/password_manager/password_store_mac.cc	(working copy)
@@ -687,7 +687,10 @@
     *port = realm_as_url.has_port() ? atoi(realm_as_url.port().c_str()) : 0;
   if (security_domain) {
     // Strip the leading '/' off of the path to get the security domain.
-    *security_domain = realm_as_url.path().substr(1);
+    if (realm_as_url.path().length() > 0)
+      *security_domain = realm_as_url.path().substr(1);
+    else
+      security_domain->clear();
   }
   return true;
 }