[CRD iOS] Branching internal and external implementations

remoting/ios/app/main.mm

 // Copyright 2017 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.
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 #import <UIKit/UIKit.h>
 
 #include "base/at_exit.h"
 #include "base/command_line.h"
-#include "base/i18n/icu_util.h"
+
 #import "remoting/ios/app/app_delegate.h"
+#import "remoting/ios/app/panel_view_controller_chromium.h"
 
 int main(int argc, char* argv[]) {
+  // Changes here should be synced with the private main.mm in ios_internal.
+
   // This class is designed to fulfill the dependents needs when it goes out of
   // scope and gets destructed.
   base::AtExitManager exitManager;
 
   // Publicize the CommandLine.
   base::CommandLine::Init(argc, argv);
 
-  // Required to find the ICU data file, used by some file_util routines.
-  base::i18n::InitializeICU();
-
-#ifdef DEBUG
-  // Set min log level for debug builds.  For some reason this has to be
-  // negative.
-  logging::SetMinLogLevel(-1);
-#endif
-
   @autoreleasepool {
+    PanelViewControllerFactory.controllerClass =
+        PanelViewControllerChromium.class;
     return UIApplicationMain(
         argc, argv, nil, NSStringFromClass([AppDelegate class]));
   }
 }