Migrate WTF::Vector::append() to ::push_back() [part 13 of N]

third_party/WebKit/Source/modules/fetch/testing/WorkerInternalsFetch.cpp

 // Copyright 2016 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 "modules/fetch/testing/WorkerInternalsFetch.h"
 
 #include "modules/fetch/Response.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 Vector<String> WorkerInternalsFetch::getInternalResponseURLList(
     WorkerInternals& internals,
     Response* response) {
   if (!response)
     return Vector<String>();
   Vector<String> urlList;
   urlList.reserveCapacity(response->internalURLList().size());
   for (const auto& url : response->internalURLList())
-    urlList.append(url);
+    urlList.push_back(url);
   return urlList;
 }
 
 }  // namespace blink