Add --headless flag to Windows

headless/lib/headless_content_main_delegate.cc

Index: headless/lib/headless_content_main_delegate.cc
diff --git a/headless/lib/headless_content_main_delegate.cc b/headless/lib/headless_content_main_delegate.cc
index 561f14be35cfa75812c88ee6cc6c9c45f652ab62..3cd0cd1e5df81731af68c18943737dd52c69638d 100644
--- a/headless/lib/headless_content_main_delegate.cc
+++ b/headless/lib/headless_content_main_delegate.cc
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include <utility>
+
 #include "headless/lib/headless_content_main_delegate.h"
 
 #include "base/base_switches.h"
@@ -156,7 +158,7 @@ void HeadlessContentMainDelegate::InitCrashReporter(
   g_headless_crash_client.Pointer()->set_crash_dumps_dir(
       browser_->options()->crash_dumps_dir);
 
-#if !defined(OS_MACOSX)
+#if defined(OS_LINUX)
   if (!browser_->options()->enable_crash_reporter) {
     DCHECK(!breakpad::IsCrashReporterEnabled());
     return;
@@ -165,7 +167,7 @@ void HeadlessContentMainDelegate::InitCrashReporter(
   if (process_type != switches::kZygoteProcess)
     breakpad::InitCrashReporter(process_type);
 #endif  // defined(HEADLESS_USE_BREAKPAD)
-#endif  // !defined(OS_MACOSX)
+#endif  // defined(OS_LINUX)
 }
 
 void HeadlessContentMainDelegate::PreSandboxStartup() {