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

components/invalidation/invalidation_test_util.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 "components/invalidation/invalidation_test_util.h"
 
 #include "base/basictypes.h"
 #include "base/json/json_writer.h"
 #include "base/json/string_escape.h"
 #include "base/values.h"
@@ skipping 81 matching lines @@
   *os << " is equal to " << PrintToString(expected_);
 }
 
 void InvalidationEqMatcher::DescribeNegationTo(::std::ostream* os) const {
   *os << " isn't equal to " << PrintToString(expected_);
 }
 
 }  // namespace
 
 void PrintTo(const AckHandle& ack_handle, ::std::ostream* os) {
-  scoped_ptr<base::Value> value(ack_handle.ToValue());
   std::string printable_ack_handle;
-  base::JSONWriter::Write(value.get(), &printable_ack_handle);
+  base::JSONWriter::Write(*ack_handle.ToValue(), &printable_ack_handle);
   *os << "{ ack_handle: " << printable_ack_handle << " }";
 }
 
 Matcher<const AckHandle&> Eq(const AckHandle& expected) {
   return MakeMatcher(new AckHandleEqMatcher(expected));
 }
 
 void PrintTo(const Invalidation& inv, ::std::ostream* os) {
   *os << "{ payload: " << inv.ToString() << " }";
 }
 
 Matcher<const Invalidation&> Eq(const Invalidation& expected) {
   return MakeMatcher(new InvalidationEqMatcher(expected));
 }
 
 }  // namespace syncer