Revert of Make --headless flag work on Mac

chrome/app/chrome_main.cc

Index: chrome/app/chrome_main.cc
diff --git a/chrome/app/chrome_main.cc b/chrome/app/chrome_main.cc
index 0d7a8ad573e4f220d0fff90b8afe7255dba4b18f..2210192aa71c441f096499c9c2a25b462bc92c17 100644
--- a/chrome/app/chrome_main.cc
+++ b/chrome/app/chrome_main.cc
@@ -20,10 +20,6 @@
 #include "chrome/common/channel_info.h"
 #include "components/version_info/version_info.h"
 #include "services/service_manager/runner/common/client_util.h"
-#endif
-
-#if defined(OS_MACOSX)
-#include "chrome/app/chrome_main_mac.h"
 #endif
 
 #if defined(OS_WIN)
@@ -97,14 +93,10 @@
   ALLOW_UNUSED_LOCAL(command_line);
 #endif
 
-#if defined(OS_LINUX) || defined(OS_MACOSX)
-  if (command_line->HasSwitch(switches::kHeadless)) {
-#if defined(OS_MACOSX)
-    SetUpBundleOverrides();
-#endif
+#if defined(OS_LINUX)
+  if (command_line->HasSwitch(switches::kHeadless))
     return headless::HeadlessShellMain(argc, argv);
-  }
-#endif  // defined(OS_LINUX) || defined(OS_MACOSX)
+#endif  // defined(OS_LINUX)
 
 #if BUILDFLAG(ENABLE_PACKAGE_MASH_SERVICES)
   version_info::Channel channel = chrome::GetChannel();