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

chrome/renderer/chrome_content_renderer_client.h

Index: chrome/renderer/chrome_content_renderer_client.h
diff --git a/chrome/renderer/chrome_content_renderer_client.h b/chrome/renderer/chrome_content_renderer_client.h
index 564cc5a899b21c3c045302eb8671b2d6887959d1..006177073f641744a8c556a0b87ea658286412bf 100644
--- a/chrome/renderer/chrome_content_renderer_client.h
+++ b/chrome/renderer/chrome_content_renderer_client.h
@@ -140,6 +140,8 @@ class ChromeContentRendererClient : public content::ContentRendererClient {
                        const GURL& url,
                        const GURL& first_party_for_cookies,
                        GURL* new_url) override;
+  bool IsPrefetchOnly(content::RenderFrame* render_frame,
+                      const blink::WebURLRequest& request) override;
   unsigned long long VisitedLinkHash(const char* canonical_url,
                                      size_t length) override;
   bool IsLinkVisited(unsigned long long link_hash) override;