Add metrics for calculating precision/recall of link navigation pre-connect triggers.

chrome/browser/net/connect_interceptor.cc

 // Copyright (c) 2013 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/net/connect_interceptor.h"
 
 #include "chrome/browser/net/predictor.h"
 #include "net/base/load_flags.h"
 #include "net/url_request/url_request.h"
 
@@ skipping 53 matching lines @@
       // We've already made any/all predictions when we navigated to the
       // referring host, so we can bail out here.
       // We don't update the RecentlySeen() time because any preconnections
       // need to be made at the first navigation (i.e., when referer was loaded)
       // and wouldn't have waited for this current request navigation.
       return;
     }
   }
   timed_cache_.SetRecentlySeen(request_scheme_host);
 
-  predictor_->RecordPreconnectNavigationStats(request_scheme_host);
-
   // Subresources for main frames usually get predicted when we detected the
   // main frame request - way back in RenderViewHost::Navigate.  So only handle
   // predictions now for subresources or for redirected hosts.
   if ((request->load_flags() & net::LOAD_SUB_FRAME) || redirected_host)
     predictor_->PredictFrameSubresources(request_scheme_host,
                                          request->first_party_for_cookies());
   return;
 }
 
 }  // namespace chrome_browser_net