[NoStatePrefetch] Do not send responses to renderer in prefetch mode.

chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc

Index: chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc
diff --git a/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc b/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc
index e56c24f6fe5572997b93a6427739c0eb68c48df7..8a640016c4fcd532e3d740916e98aa8cc5e41ac0 100644
--- a/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc
+++ b/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc
@@ -722,6 +722,22 @@ bool ChromeResourceDispatcherHostDelegate::ShouldInterceptResourceAsStream(
   return false;
 }
 
+bool ChromeResourceDispatcherHostDelegate::ShouldSinkResponse(
+    net::URLRequest* request,
+    ResourceType resource_type) {
+  if (resource_type == content::RESOURCE_TYPE_MAIN_FRAME)
+    return false;
+
+  const ResourceRequestInfo* info = ResourceRequestInfo::ForRequest(request);
+  if (info->GetVisibilityState() != blink::WebPageVisibilityStatePrerender)
+    return false;
+
+  // TODO: Use this when implemented. Could there be a race condition though?
+  // return prerender::PrerenderManager::GetMode() ==
+  //    prerender::PRERENDER_MODE_NOSTATE_PREFETCH;
+  return true;
+}
+
 void ChromeResourceDispatcherHostDelegate::OnStreamCreated(
     net::URLRequest* request,
     std::unique_ptr<content::StreamInfo> stream) {