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

remoting/host/it2me/it2me_native_messaging_host_unittest.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 "remoting/host/it2me/it2me_native_messaging_host.h"
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
@@ skipping 273 matching lines @@
     return nullptr;
   }
 
   return make_scoped_ptr(
       static_cast<base::DictionaryValue*>(message.release()));
 }
 
 void It2MeNativeMessagingHostTest::WriteMessageToInputPipe(
     const base::Value& message) {
   std::string message_json;
-  base::JSONWriter::Write(&message, &message_json);
+  base::JSONWriter::Write(message, &message_json);
 
   uint32 length = message_json.length();
   input_write_file_.WriteAtCurrentPos(reinterpret_cast<char*>(&length),
                                       sizeof(length));
   input_write_file_.WriteAtCurrentPos(message_json.data(), length);
 }
 
 void It2MeNativeMessagingHostTest::VerifyHelloResponse(int request_id) {
   scoped_ptr<base::DictionaryValue> response = ReadMessageFromOutputPipe();
   VerifyCommonProperties(response.Pass(), "helloResponse", request_id);
@@ skipping 236 matching lines @@
 
 // Verify rejection if type is unrecognized.
 TEST_F(It2MeNativeMessagingHostTest, InvalidType) {
   base::DictionaryValue message;
   message.SetString("type", "xxx");
   TestBadRequest(message, true);
 }
 
 }  // namespace remoting