Use schemas bundled in extensions to convert policies loaded on Windows.

components/policy/core/common/registry_dict_win.h

Index: components/policy/core/common/registry_dict_win.h
diff --git a/components/policy/core/common/registry_dict_win.h b/components/policy/core/common/registry_dict_win.h
index fb480918851d5a6636be93445dfd3f6b71f6742c..da48c857da8b4262482b2ea280aff546c88939ed 100644
--- a/components/policy/core/common/registry_dict_win.h
+++ b/components/policy/core/common/registry_dict_win.h
@@ -16,12 +16,13 @@
 #include "components/policy/policy_export.h"
 
 namespace base {
-class DictionaryValue;
 class Value;
 }
 
 namespace policy {
 
+class Schema;
+
 // A case-insensitive string comparison functor.
 struct POLICY_EXPORT CaseInsensitiveStringCompare {
   bool operator()(const std::string& a, const std::string& b) const;
@@ -70,11 +71,10 @@ class POLICY_EXPORT RegistryDict {
   void ReadRegistry(HKEY hive, const base::string16& root);
 
   // Converts the dictionary to base::Value representation. For key/value name
-  // collisions, the key wins. |schema| supplies an optional JSON schema that
-  // will be used to map types to base::Value types. The returned object is
-  // either a base::DictionaryValue or a base::ListValue.
-  scoped_ptr<base::Value> ConvertToJSON(
-      const base::DictionaryValue* schema) const;
+  // collisions, the key wins. |schema| is used to determine the expected type
+  // for each policy.
+  // The returned object is either a base::DictionaryValue or a base::ListValue.
+  scoped_ptr<base::Value> ConvertToJSON(const Schema& schema) const;
 
   const KeyMap& keys() const { return keys_; }
   const ValueMap& values() const { return values_; }