Surface error messages from ONC parsing in about:policy.

chrome/browser/policy/configuration_policy_handler.cc

Index: chrome/browser/policy/configuration_policy_handler.cc
diff --git a/chrome/browser/policy/configuration_policy_handler.cc b/chrome/browser/policy/configuration_policy_handler.cc
index 18e5696923bfc8ad753f6fb682fff5538eb879de..ee470ea85bed68ea5b9905c7ef4e9ff341fe000b 100644
--- a/chrome/browser/policy/configuration_policy_handler.cc
+++ b/chrome/browser/policy/configuration_policy_handler.cc
@@ -166,8 +166,15 @@ ConfigurationPolicyType TypeCheckingPolicyHandler::policy_type() const {
 
 bool TypeCheckingPolicyHandler::CheckPolicySettings(const PolicyMap& policies,
                                                     PolicyErrorMap* errors) {
-  const Value* value = policies.Get(policy_type_);
-  if (value && value_type_ != value->GetType()) {
+  const Value* value = NULL;
+  return CheckAndGetValue(policies, errors, &value);
+}
+
+bool TypeCheckingPolicyHandler::CheckAndGetValue(const PolicyMap& policies,
+                                                 PolicyErrorMap* errors,
+                                                 const Value** value) {
+  *value = policies.Get(policy_type_);
+  if (*value && !(*value)->IsType(value_type_)) {
     errors->AddError(policy_type_,
                      IDS_POLICY_TYPE_ERROR,
                      ValueTypeToString(value_type_));
@@ -176,7 +183,6 @@ bool TypeCheckingPolicyHandler::CheckPolicySettings(const PolicyMap& policies,
   return true;
 }
 
-
 // SimplePolicyHandler implementation ------------------------------------------
 
 SimplePolicyHandler::SimplePolicyHandler(