Revert of Add --headless flag to Windows

headless/app/headless_shell_main.cc

Index: headless/app/headless_shell_main.cc
diff --git a/headless/app/headless_shell_main.cc b/headless/app/headless_shell_main.cc
index 5f63fcb9295c7337035d638479d86b8c260a4182..3ae4553b06854f9745690e4cc992267a7e4862ad 100644
--- a/headless/app/headless_shell_main.cc
+++ b/headless/app/headless_shell_main.cc
@@ -2,20 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "build/build_config.h"
 #include "headless/public/headless_shell.h"
 
-#if defined(OS_WIN)
-#include "content/public/app/sandbox_helper_win.h"
-#include "sandbox/win/src/sandbox_types.h"
-#endif
-
 int main(int argc, const char** argv) {
-#if defined(OS_WIN)
-  sandbox::SandboxInterfaceInfo sandbox_info = {0};
-  content::InitializeSandboxInfo(&sandbox_info);
-  return headless::HeadlessShellMain(0, &sandbox_info);
-#else
   return headless::HeadlessShellMain(argc, argv);
-#endif  // defined(OS_WIN)
 }