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

chrome/browser/safe_browsing/incident_reporting/preference_validation_delegate.cc

 // Copyright 2014 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/safe_browsing/incident_reporting/preference_validation_delegate.h"
 
 #include <string>
 #include <vector>
 
 #include "base/json/json_writer.h"
@@ skipping 44 matching lines @@
     const base::Value* value,
     PrefHashStoreTransaction::ValueState value_state,
     bool is_personal) {
   TPIncident_ValueState proto_value_state = MapValueState(value_state);
   if (proto_value_state != TPIncident::UNKNOWN) {
     scoped_ptr<TPIncident> incident(
         new ClientIncidentReport_IncidentData_TrackedPreferenceIncident());
     incident->set_path(pref_path);
     if (!value ||
         (!value->GetAsString(incident->mutable_atomic_value()) &&
-         !base::JSONWriter::Write(value, incident->mutable_atomic_value()))) {
+         !base::JSONWriter::Write(*value, incident->mutable_atomic_value()))) {
       incident->clear_atomic_value();
     }
     incident->set_value_state(proto_value_state);
     incident_receiver_->AddIncidentForProfile(
         profile_, make_scoped_ptr(new TrackedPreferenceIncident(incident.Pass(),
                                                                 is_personal)));
   }
 }
 
 void PreferenceValidationDelegate::OnSplitPreferenceValidation(
@@ skipping 14 matching lines @@
       incident->add_split_key(*scan);
     }
     incident->set_value_state(proto_value_state);
     incident_receiver_->AddIncidentForProfile(
         profile_, make_scoped_ptr(new TrackedPreferenceIncident(incident.Pass(),
                                                                 is_personal)));
   }
 }
 
 }  // namespace safe_browsing