Windows: Disable the sandbox if windows_sandbox_info is null

This restores the behavior prior to revision 438382c. Calling
InitializeSandboxInfo from inside libcef won’t work unless libcef is
statically linked with the executable, so there's no point in doing so.
See the Chromium sandbox docs for background.

libcef/browser/context.cc

@@ -392,10 +392,8 @@ bool CefContext::Initialize(const CefMainArgs& args,
 #if defined(OS_WIN)
   sandbox::SandboxInterfaceInfo sandbox_info = {0};
   if (windows_sandbox_info == nullptr) {
-    if (!settings.no_sandbox) {
-      content::InitializeSandboxInfo(&sandbox_info);
-    }
     windows_sandbox_info = &sandbox_info;
+    settings_.no_sandbox = true;
   }
 
   params.instance = args.instance;