Fix display and progressive disclosure for multi-line values in about:policy.

chrome/browser/policy/policy_error_map.cc

Index: chrome/browser/policy/policy_error_map.cc
diff --git a/chrome/browser/policy/policy_error_map.cc b/chrome/browser/policy/policy_error_map.cc
index 956392a6ab661624eab57d1b9b7ad53d771c2d6f..daf167a25af39df13af324990039c5adc4fa6319 100644
--- a/chrome/browser/policy/policy_error_map.cc
+++ b/chrome/browser/policy/policy_error_map.cc
@@ -57,7 +57,7 @@ string16 PolicyErrorMap::GetErrors(ConfigurationPolicyType policy) {
   std::vector<string16> list;
   for (const_iterator it = range.first; it != range.second; ++it)
     list.push_back(it->second);
-  return JoinString(list, ' ');
+  return JoinString(list, '\n');
 }
 
 bool PolicyErrorMap::empty() {