Remove the speculative resource prefetching code. This was experimental code added 1.5 years ago an…

chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc

 // 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.
 
 #include "chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.h"
 
 #include <string>
 
 #include "base/base64.h"
 #include "base/logging.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/component_updater/component_updater_service.h"
 #include "chrome/browser/component_updater/pnacl/pnacl_component_installer.h"
 #include "chrome/browser/content_settings/host_content_settings_map.h"
 #include "chrome/browser/download/download_request_limiter.h"
 #include "chrome/browser/download/download_resource_throttle.h"
 #include "chrome/browser/extensions/api/streams_private/streams_private_api.h"
 #include "chrome/browser/extensions/extension_renderer_state.h"
 #include "chrome/browser/extensions/user_script_listener.h"
 #include "chrome/browser/external_protocol/external_protocol_handler.h"
 #include "chrome/browser/google/google_util.h"
 #include "chrome/browser/metrics/variations/variations_http_header_provider.h"
-#include "chrome/browser/net/resource_prefetch_predictor_observer.h"
 #include "chrome/browser/prefetch/prefetch_field_trial.h"
 #include "chrome/browser/prerender/prerender_manager.h"
 #include "chrome/browser/prerender/prerender_pending_swap_throttle.h"
 #include "chrome/browser/prerender/prerender_resource_throttle.h"
 #include "chrome/browser/prerender/prerender_tracker.h"
 #include "chrome/browser/prerender/prerender_util.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_io_data.h"
 #include "chrome/browser/renderer_host/chrome_url_request_user_data.h"
 #include "chrome/browser/renderer_host/safe_browsing_resource_throttle_factory.h"
@@ skipping 282 matching lines @@
   AppendStandardResourceThrottles(request,
                                   resource_context,
                                   resource_type,
                                   throttles);
   if (!is_prerendering) {
     AppendComponentUpdaterThrottles(request,
                                     resource_context,
                                     resource_type,
                                     throttles);
   }
-
-  if (io_data->resource_prefetch_predictor_observer()) {
-    io_data->resource_prefetch_predictor_observer()->OnRequestStarted(
-        request, resource_type, child_id, route_id);
-  }
 }
 
 void ChromeResourceDispatcherHostDelegate::WillTransferRequestToNewProcess(
     int old_child_id,
     int old_route_id,
     int old_request_id,
     int new_child_id,
     int new_route_id,
     int new_request_id) {
   // If a prerender, it have should been aborted on cross-process
@@ skipping 280 matching lines @@
   GURL webstore_url(extension_urls::GetWebstoreLaunchURL());
   if (request->url().DomainIs(webstore_url.host().c_str())) {
     net::HttpResponseHeaders* response_headers = request->response_headers();
     if (!response_headers->HasHeaderValue("x-frame-options", "deny") &&
         !response_headers->HasHeaderValue("x-frame-options", "sameorigin")) {
       response_headers->RemoveHeader("x-frame-options");
       response_headers->AddHeader("x-frame-options: sameorigin");
     }
   }
 
-  if (io_data->resource_prefetch_predictor_observer())
-    io_data->resource_prefetch_predictor_observer()->OnResponseStarted(request);
-
   prerender::URLRequestResponseStarted(request);
 }
 
 void ChromeResourceDispatcherHostDelegate::OnRequestRedirected(
     const GURL& redirect_url,
     net::URLRequest* request,
     content::ResourceContext* resource_context,
     content::ResourceResponse* response) {
   ProfileIOData* io_data = ProfileIOData::FromResourceContext(resource_context);
   const ResourceRequestInfo* info = ResourceRequestInfo::ForRequest(request);
 
 #if defined(ENABLE_ONE_CLICK_SIGNIN)
   // See if the response contains the Google-Accounts-SignIn header.  If so,
   // then the user has just finished signing in, and the server is allowing the
   // browser to suggest connecting the user's profile to the account.
   OneClickSigninHelper::ShowInfoBarIfPossible(request, io_data,
                                               info->GetChildID(),
                                               info->GetRouteID());
   AppendChromeSyncGaiaHeader(request, resource_context);
 #endif
 
   // In the Mirror world, Chrome should append a X-Chrome-Connected header to
   // all Gaia requests from a connected profile so Gaia could return a 204
   // response and let Chrome handle the action with native UI. The only
   // exception is requests from gaia webview, since the native profile
   // management UI is built on top of it.
   signin::AppendMirrorRequestHeaderIfPossible(request, redirect_url, io_data,
       info->GetChildID(), info->GetRouteID());
-
-  if (io_data->resource_prefetch_predictor_observer()) {
-    io_data->resource_prefetch_predictor_observer()->OnRequestRedirected(
-        redirect_url, request);
-  }
 }