Convert JsonWriter::Write to taking a const ref for the in-param

components/policy/core/common/cloud/policy_header_service.cc

 // Copyright 2013 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 "components/policy/core/common/cloud/policy_header_service.h"
 
 #include "base/base64.h"
 #include "base/json/json_writer.h"
 #include "base/values.h"
 #include "components/policy/core/common/cloud/cloud_policy_store.h"
@@ skipping 56 matching lines @@
   if (user_policy_store_->policy()->has_policy_token()) {
     value.SetString(kUserPolicyTokenKey,
                     user_policy_store_->policy()->policy_token());
   }
   if (!verification_key_hash_.empty())
     value.SetString(kVerificationKeyHashKey, verification_key_hash_);
 
   // TODO(atwilson): add user_policy_token once the server starts sending it
   // down (http://crbug.com/326799).
   std::string json;
-  base::JSONWriter::Write(&value, &json);
+  base::JSONWriter::Write(value, &json);
   DCHECK(!json.empty());
 
   // Base64-encode the result so we can include it in a header.
   std::string encoded;
   base::Base64Encode(json, &encoded);
   return encoded;
 }
 
 void PolicyHeaderService::OnStoreLoaded(CloudPolicyStore* store) {
   // If we have a PolicyHeaderIOHelper, notify it of the new header value.
   if (!helpers_.empty()) {
     std::string new_header = CreateHeaderValue();
     for (std::vector<PolicyHeaderIOHelper*>::const_iterator it =
              helpers_.begin(); it != helpers_.end(); ++it) {
       (*it)->UpdateHeader(new_header);
     }
   }
 }
 
 void PolicyHeaderService::OnStoreError(CloudPolicyStore* store) {
   // Do nothing on errors.
 }
 
 std::vector<PolicyHeaderIOHelper*> PolicyHeaderService::GetHelpersForTest() {
   return helpers_;
 }
 
 }  // namespace policy