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

Index: chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc
===================================================================
--- chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc	(revision 243063)
+++ chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc	(working copy)
@@ -21,7 +21,6 @@
 #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"
@@ -324,11 +323,6 @@
                                     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(
@@ -629,9 +623,6 @@
     }
   }
 
-  if (io_data->resource_prefetch_predictor_observer())
-    io_data->resource_prefetch_predictor_observer()->OnResponseStarted(request);
-
   prerender::URLRequestResponseStarted(request);
 }
 
@@ -660,9 +651,4 @@
   // 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);
-  }
 }