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

net/http/http_response_headers.cc

Index: net/http/http_response_headers.cc
diff --git a/net/http/http_response_headers.cc b/net/http/http_response_headers.cc
index 9574b03bc851209f6d53797d7019690fcfd8d76b..f44e279d29bfa820f54af82dd9affbe012c2542d 100644
--- a/net/http/http_response_headers.cc
+++ b/net/http/http_response_headers.cc
@@ -1416,7 +1416,7 @@ std::unique_ptr<base::Value> HttpResponseHeaders::NetLogCallback(
     NetLogCaptureMode capture_mode) const {
   std::unique_ptr<base::DictionaryValue> dict(new base::DictionaryValue());
   base::ListValue* headers = new base::ListValue();
-  headers->Append(new base::StringValue(EscapeNonASCII(GetStatusLine())));
+  headers->AppendString(EscapeNonASCII(GetStatusLine()));
   size_t iterator = 0;
   std::string name;
   std::string value;
@@ -1425,10 +1425,8 @@ std::unique_ptr<base::Value> HttpResponseHeaders::NetLogCallback(
         ElideHeaderValueForNetLog(capture_mode, name, value);
     std::string escaped_name = EscapeNonASCII(name);
     std::string escaped_value = EscapeNonASCII(log_value);
-    headers->Append(
-      new base::StringValue(
-          base::StringPrintf("%s: %s", escaped_name.c_str(),
-                             escaped_value.c_str())));
+    headers->AppendString(base::StringPrintf("%s: %s", escaped_name.c_str(),
+                                             escaped_value.c_str()));
   }
   dict->Set("headers", headers);
   return std::move(dict);