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

chrome/renderer/chrome_content_renderer_client.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_RENDERER_CHROME_CONTENT_RENDERER_CLIENT_H_
 #define CHROME_RENDERER_CHROME_CONTENT_RENDERER_CLIENT_H_
 
 #include <stddef.h>
 
 #include <map>
@@ skipping 122 matching lines @@
                   const GURL& url,
                   const std::string& http_method,
                   bool is_initial_navigation,
                   bool is_server_redirect,
                   bool* send_referrer) override;
   bool WillSendRequest(blink::WebFrame* frame,
                        ui::PageTransition transition_type,
                        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;
   blink::WebPrescientNetworking* GetPrescientNetworking() override;
   bool ShouldOverridePageVisibilityState(
       const content::RenderFrame* render_frame,
       blink::WebPageVisibilityState* override_state) override;
   bool IsExternalPepperPlugin(const std::string& module_name) override;
   blink::WebSpeechSynthesizer* OverrideSpeechSynthesizer(
       blink::WebSpeechSynthesizerClient* client) override;
@@ skipping 100 matching lines @@
   std::set<std::string> allowed_camera_device_origins_;
   std::set<std::string> allowed_compositor_origins_;
 #endif
 
 #if defined(OS_CHROMEOS)
   std::unique_ptr<LeakDetectorRemoteClient> leak_detector_remote_client_;
 #endif
 };
 
 #endif  // CHROME_RENDERER_CHROME_CONTENT_RENDERER_CLIENT_H_