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

net/http/http_server_properties_manager_unittest.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 "net/http/http_server_properties_manager.h"
 
 #include "base/basictypes.h"
 #include "base/json/json_writer.h"
 #include "base/message_loop/message_loop.h"
 #include "base/prefs/pref_registry_simple.h"
@@ skipping 684 matching lines @@
       "3.1\"}],\"network_stats\":{\"srtt\":42}},\"www.google.com:80\":"
       "{\"alternative_service\":[{\"port\":443,\"probability\":1.0,"
       "\"protocol_str\":\"npn-h2\"}]}},\"supports_quic\":"
       "{\"address\":\"127.0.0.1\",\"used_quic\":true},\"version\":3}";
 
   const base::Value* http_server_properties =
       pref_service_.GetUserPref(kTestHttpServerProperties);
   ASSERT_NE(nullptr, http_server_properties);
   std::string preferences_json;
   EXPECT_TRUE(
-      base::JSONWriter::Write(http_server_properties, &preferences_json));
+      base::JSONWriter::Write(*http_server_properties, &preferences_json));
   EXPECT_EQ(expected_json, preferences_json);
 }
 
 TEST_F(HttpServerPropertiesManagerTest, ShutdownWithPendingUpdateCache0) {
   // Post an update task to the UI thread.
   http_server_props_manager_->ScheduleUpdateCacheOnPrefThread();
   // Shutdown comes before the task is executed.
   http_server_props_manager_->ShutdownOnPrefThread();
   http_server_props_manager_.reset();
   // Run the task after shutdown and deletion.
@@ skipping 58 matching lines @@
   // Run the task after shutdown, but before deletion.
   base::RunLoop().RunUntilIdle();
   Mock::VerifyAndClearExpectations(http_server_props_manager_.get());
   http_server_props_manager_.reset();
   base::RunLoop().RunUntilIdle();
 }
 
 }  // namespace
 
 }  // namespace net