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

content/public/renderer/content_renderer_client.h

Index: content/public/renderer/content_renderer_client.h
diff --git a/content/public/renderer/content_renderer_client.h b/content/public/renderer/content_renderer_client.h
index 81f2533054e62a1665b536fa1539a9e15ceb32dc..7847d7aa23374008c843132360b7aff4048b7cef 100644
--- a/content/public/renderer/content_renderer_client.h
+++ b/content/public/renderer/content_renderer_client.h
@@ -248,6 +248,11 @@ class CONTENT_EXPORT ContentRendererClient {
                                const GURL& first_party_for_cookies,
                                GURL* new_url);
 
+  // Returns true if the request is associated with a document that is in
+  // ""prefetch only" mode, and will not be rendered.
+  virtual bool IsPrefetchOnly(RenderFrame* render_frame,
+                              const blink::WebURLRequest& request);
+
   // See blink::Platform.
   virtual unsigned long long VisitedLinkHash(const char* canonical_url,
                                              size_t length);