Remove ListValue::Append(new {Fundamental,String}Value(...)) pattern in //ipc

ipc/ipc_message_utils_unittest.cc

 // Copyright (c) 2012 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 "ipc/ipc_message_utils.h"
 
 #include <stddef.h>
 #include <stdint.h>
 #include <memory>
 
@@ skipping 87 matching lines @@
   value->SetWithoutPathExpansion("foo", new base::FundamentalValue(42));
   value->SetWithoutPathExpansion("bar", new base::FundamentalValue(3.14));
   value->SetWithoutPathExpansion("baz", new base::StringValue("hello"));
   value->SetWithoutPathExpansion("qux", base::Value::CreateNullValue());
 
   std::unique_ptr<base::DictionaryValue> nested_dict(new base::DictionaryValue);
   nested_dict->SetWithoutPathExpansion("foobar", new base::FundamentalValue(5));
   value->SetWithoutPathExpansion("nested", std::move(nested_dict));
 
   std::unique_ptr<base::ListValue> list_value(new base::ListValue);
-  list_value->Append(new base::StringValue("im a string"));
-  list_value->Append(new base::StringValue("im another string"));
+  list_value->AppendString("im a string");
+  list_value->AppendString("im another string");
   value->SetWithoutPathExpansion("awesome-list", std::move(list_value));
 
   base::Pickle pickle;
   IPC::WriteParam(&pickle, *value);
 
   base::PickleSizer sizer;
   IPC::GetParamSize(&sizer, *value);
 
   EXPECT_EQ(sizer.payload_size(), pickle.payload_size());
 }
 
 TEST(IPCMessageUtilsTest, JsonValueSize) {
   const char kJson[] = "[ { \"foo\": \"bar\", \"baz\": 1234.0 } ]";
   std::unique_ptr<base::Value> json_value = base::JSONReader::Read(kJson);
   EXPECT_NE(nullptr, json_value);
   base::ListValue value;
   value.Append(std::move(json_value));
 
   base::Pickle pickle;
   IPC::WriteParam(&pickle, value);
 
   base::PickleSizer sizer;
   IPC::GetParamSize(&sizer, value);
 
   EXPECT_EQ(sizer.payload_size(), pickle.payload_size());
 }
 
 }  // namespace
 }  // namespace IPC