[Mac] Make --apps-keep-chrome-alive on by default.

chrome/browser/about_flags.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 "chrome/browser/about_flags.h"
 
 #include <iterator>
 #include <map>
 #include <set>
 #include <utility>
@@ skipping 1830 matching lines @@
 #endif
   // TODO(tyoshino): Remove this temporary flag and command line switch. See
   // crbug.com/366483 for the target milestone.
   {
     "allow-insecure-websocket-from-https-origin",
     IDS_FLAGS_ALLOW_INSECURE_WEBSOCKET_FROM_HTTPS_ORIGIN_NAME,
     IDS_FLAGS_ALLOW_INSECURE_WEBSOCKET_FROM_HTTPS_ORIGIN_DESCRIPTION,
     kOsAll,
     SINGLE_VALUE_TYPE(switches::kAllowInsecureWebSocketFromHttpsOrigin)
   },
-#if defined(OS_MACOSX)
-  {
-    "apps-keep-chrome-alive",
-    IDS_FLAGS_APPS_KEEP_CHROME_ALIVE_NAME,
-    IDS_FLAGS_APPS_KEEP_CHROME_ALIVE_DESCRIPTION,
-    kOsMac,
-    SINGLE_VALUE_TYPE(switches::kAppsKeepChromeAlive)
-  },
-#endif
   {
     "enable-apps-file-associations",
     IDS_FLAGS_ENABLE_APPS_FILE_ASSOCIATIONS_NAME,
     IDS_FLAGS_ENABLE_APPS_FILE_ASSOCIATIONS_DESCRIPTION,
     kOsMac,
     SINGLE_VALUE_TYPE(switches::kEnableAppsFileAssociations)
   },
 #if defined(OS_ANDROID)
   {
     "enable-embeddedsearch-api",
@@ skipping 612 matching lines @@
 }
 
 const Experiment* GetExperiments(size_t* count) {
   *count = num_experiments;
   return experiments;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags