Implement $Secure- cookie prefix

content/browser/frame_host/render_frame_message_filter.cc

Index: content/browser/frame_host/render_frame_message_filter.cc
diff --git a/content/browser/frame_host/render_frame_message_filter.cc b/content/browser/frame_host/render_frame_message_filter.cc
index d7e9d9e605ba6a43af0ec920b37f004bdfc1c8a7..d1a0bc40ae2eb6e87580bef5d3d26411c2c3a0b3 100644
--- a/content/browser/frame_host/render_frame_message_filter.cc
+++ b/content/browser/frame_host/render_frame_message_filter.cc
@@ -342,6 +342,8 @@ void RenderFrameMessageFilter::OnSetCookie(int render_frame_id,
           url, first_party_for_cookies, cookie, resource_context_,
           render_process_id_, render_frame_id, &options)) {
     net::URLRequestContext* context = GetRequestContextForURL(url);
+    if (GetContentClient()->browser()->ExperimentalFeaturesEnabled())
+      options.set_enforce_prefixes();
     // Pass a null callback since we don't care about when the 'set' completes.
     context->cookie_store()->SetCookieWithOptionsAsync(
         url, cookie, options, net::CookieStore::SetCookiesCallback());