Remove old prefetcher histogram code in render_frame_impl

content/public/renderer/document_state.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 CONTENT_PUBLIC_RENDERER_DOCUMENT_STATE_H_
 #define CONTENT_PUBLIC_RENDERER_DOCUMENT_STATE_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 149 matching lines @@
   bool was_fetched_via_proxy() const { return was_fetched_via_proxy_; }
   void set_was_fetched_via_proxy(bool value) {
     was_fetched_via_proxy_ = value;
   }
 
   const net::HostPortPair& proxy_server() const { return proxy_server_; }
   void set_proxy_server(const net::HostPortPair& proxy_server) {
     proxy_server_ = proxy_server;
   }
 
-  void set_was_prefetcher(bool value) { was_prefetcher_ = value; }
-  bool was_prefetcher() const { return was_prefetcher_; }
-
-  void set_was_referred_by_prefetcher(bool value) {
-    was_referred_by_prefetcher_ = value;
-  }
-  bool was_referred_by_prefetcher() const {
-    return was_referred_by_prefetcher_;
-  }
-
-  void set_was_after_preconnect_request(bool value) {
-    was_after_preconnect_request_ = value;
-  }
-  bool was_after_preconnect_request() { return was_after_preconnect_request_; }
 
   // For LoadDataWithBaseURL navigations, |was_load_data_with_base_url_request_|
   // is set to true and |data_url_| is set to the data URL of the navigation.
   // Otherwise, |was_load_data_with_base_url_request_| is false and |data_url_|
   // is empty.
   void set_was_load_data_with_base_url_request(bool value) {
     was_load_data_with_base_url_request_ = value;
   }
   bool was_load_data_with_base_url_request() const {
     return was_load_data_with_base_url_request_;
@@ skipping 28 matching lines @@
   bool load_histograms_recorded_;
   bool web_timing_histograms_recorded_;
   bool was_fetched_via_spdy_;
   bool was_npn_negotiated_;
   std::string npn_negotiated_protocol_;
   bool was_alternate_protocol_available_;
   net::HttpResponseInfo::ConnectionInfo connection_info_;
   bool was_fetched_via_proxy_;
   net::HostPortPair proxy_server_;
 
-  // A prefetcher is a page that contains link rel=prefetch elements.
-  bool was_prefetcher_;
-  bool was_referred_by_prefetcher_;
-  bool was_after_preconnect_request_;
-
   bool was_load_data_with_base_url_request_;
   GURL data_url_;
 
   LoadType load_type_;
 
   std::unique_ptr<NavigationState> navigation_state_;
 
   bool can_load_local_resources_;
 };
 
 #endif  // CONTENT_PUBLIC_RENDERER_DOCUMENT_STATE_H_
 
 }  // namespace content