Correct const accessors in base/values.(h|cc)

chrome/browser/policy/configuration_policy_handler.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/policy/configuration_policy_handler.h"
 
 #include <string>
 
 #include "base/file_path.h"
 #include "base/json/json_writer.h"
@@ skipping 902 matching lines @@
 }
 
 const Value* ProxyPolicyHandler::GetProxyPolicyValue(
     const PolicyMap& policies, const char* policy_name) {
   // See note on the ProxyPolicyHandler implementation above.
   const Value* value = policies.GetValue(key::kProxySettings);
   const DictionaryValue* settings;
   if (!value || !value->GetAsDictionary(&settings))
     return NULL;
 
-  Value* policy_value = NULL;
+  const Value* policy_value = NULL;
   std::string tmp;
   if (!settings->Get(policy_name, &policy_value) ||
       policy_value->IsType(Value::TYPE_NULL) ||
       (policy_value->IsType(Value::TYPE_STRING) &&
        policy_value->GetAsString(&tmp) &&
        tmp.empty())) {
     return NULL;
   }
   return policy_value;
 }
@@ skipping 334 matching lines @@
           errors->AddError(policy_name(),
                            IDS_POLICY_OUT_OF_RANGE_ERROR,
                            base::IntToString(restore_value));
       }
     }
   }
   return true;
 }
 
 }  // namespace policy