Fix DCHECH errors on Windows

headless/lib/browser/headless_browser_impl.cc

Index: headless/lib/browser/headless_browser_impl.cc
diff --git a/headless/lib/browser/headless_browser_impl.cc b/headless/lib/browser/headless_browser_impl.cc
index c45408f9e38013ca3c1602cb97439a2633178ea7..0bc9ab655a50646c8602f235a61e2e829d803304 100644
--- a/headless/lib/browser/headless_browser_impl.cc
+++ b/headless/lib/browser/headless_browser_impl.cc
@@ -196,16 +196,24 @@ HeadlessBrowserContext* HeadlessBrowserImpl::GetBrowserContextForId(
   return find_it->second.get();
 }
 
-#if !defined(OS_WIN)
+#if defined(OS_WIN)
+void RunChildProcessIfNeeded(HINSTANCE instance,
+                             sandbox::SandboxInterfaceInfo* sandbox_info) {
+  base::CommandLine::Init(0, nullptr);
+  HeadlessBrowser::Options::Builder builder(0, nullptr);
+  builder.SetInstance(instance);
+  builder.SetSandboxInfo(std::move(sandbox_info));
+#else
 void RunChildProcessIfNeeded(int argc, const char** argv) {
   base::CommandLine::Init(argc, argv);
+  HeadlessBrowser::Options::Builder builder(argc, argv);
+#endif  // defined(OS_WIN)
   const base::CommandLine& command_line(
       *base::CommandLine::ForCurrentProcess());
 
   if (!command_line.HasSwitch(::switches::kProcessType))
     return;
 
-  HeadlessBrowser::Options::Builder builder(argc, argv);
   if (command_line.HasSwitch(switches::kUserAgent)) {
     std::string ua = command_line.GetSwitchValueASCII(switches::kUserAgent);
     if (net::HttpUtil::IsValidHeaderValue(ua))
@@ -215,7 +223,6 @@ void RunChildProcessIfNeeded(int argc, const char** argv) {
   exit(RunContentMain(builder.Build(),
                       base::Callback<void(HeadlessBrowser*)>()));
 }
-#endif  // !defined(OS_WIN)
 
 int HeadlessBrowserMain(
     HeadlessBrowser::Options options,