[mac] Use -[NSApp isActive] for checking if current app is active.

chrome/browser/mac/relauncher.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.
 
 #include "chrome/browser/mac/relauncher.h"
 
 #import <AppKit/AppKit.h>
 
 #include <AvailabilityMacros.h>
 #include <crt_externs.h>
@@ skipping 82 matching lines @@
 
 bool RelaunchAppWithHelper(const std::string& helper,
                            const std::vector<std::string>& relauncher_args,
                            const std::vector<std::string>& args) {
   std::vector<std::string> relaunch_args;
   relaunch_args.push_back(helper);
   relaunch_args.push_back(RelauncherTypeArg());
 
   // If this application isn't in the foreground, the relaunched one shouldn't
   // be either.
-  if (![[NSRunningApplication currentApplication] isActive]) {
+  if (![NSApp isActive]) {
     relaunch_args.push_back(kRelauncherBackgroundArg);
   }
 
   relaunch_args.insert(relaunch_args.end(),
                        relauncher_args.begin(), relauncher_args.end());
 
   relaunch_args.push_back(kRelauncherArgSeparator);
 
   // When using the CommandLine interface, -psn_ may have been rewritten as
   // --psn_. Look for both.
@@ skipping 253 matching lines @@
   if (!dmg_bsd_device_name.empty()) {
     EjectAndTrashDiskImage(dmg_bsd_device_name);
   }
 
   return 0;
 }
 
 }  // namespace internal
 
 }  // namespace mac_relauncher