[Clean Skeleton] Migrate code to clean/

ios/clean/chrome/app/main.mm

 // 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.
 
 // ======                        New Architecture                         =====
 // =         This code is only used in the new iOS Chrome architecture.       =
 // ============================================================================
 
 #import <UIKit/UIKit.h>
 
 #include "base/at_exit.h"
 #include "base/debug/crash_logging.h"
 #include "components/crash/core/common/crash_keys.h"
-#include "ios/chrome/app/app_delegate.h"
 #include "ios/chrome/app/startup/ios_chrome_main.h"
 #include "ios/chrome/browser/crash_report/breakpad_helper.h"
 #include "ios/chrome/browser/crash_report/crash_keys.h"
 #include "ios/chrome/common/channel_info.h"
+#include "ios/clean/chrome/app/app_delegate.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 namespace {
 
 void StartCrashController() {
   std::string channel_string = GetChannelString();
 
@@ skipping 34 matching lines @@
     // Always ignore SIGPIPE.  Chrome should always check the return value of
     // write() instead of relying on this signal.
     CHECK_NE(SIG_ERR, signal(SIGPIPE, SIG_IGN));
   }
 
   @autoreleasepool {
     return UIApplicationMain(argc, argv, nil,
                              NSStringFromClass([AppDelegate class]));
   }
 }