[ObjC ARC] Converts ios/chrome/browser/ui/ntp:perf_tests to ARC.

ios/chrome/browser/ui/ntp/new_tab_page_perftest.mm

 // Copyright 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.
 
 #import "base/test/ios/wait_util.h"
 #include "ios/chrome/browser/sessions/ios_chrome_tab_restore_service_factory.h"
 #import "ios/chrome/browser/tabs/tab_model.h"
 #include "ios/chrome/browser/test/perf_test_with_bvc_ios.h"
 #import "ios/chrome/browser/ui/browser_view_controller.h"
 #import "ios/chrome/browser/ui/browser_view_controller_dependency_factory.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 
 const NSTimeInterval kMaxUICatchupDelay = 2.0;  // seconds
 
 class NewTabPagePerfTest : public PerfTestWithBVC {
  public:
   NewTabPagePerfTest()
       : PerfTestWithBVC("NTP - Create",
                         "First Tab",
                         "",
@@ skipping 42 matching lines @@
   RepeatTimedRuns("NTP Hammer Create",
                   ^(int index) {
                     return TimedNewTab();
                   },
                   nil);
   // Allows the run loops to run before teardown.
   SettleUI();
 }
 
 }  // anonymous namespace