Cleanup by removing thread hop resource throttle code; experiment's over.

chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc

Index: chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc
diff --git a/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc b/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc
index e56c24f6fe5572997b93a6427739c0eb68c48df7..f571e36b217d2901e24353d7ff876dcea8acca57 100644
--- a/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc
+++ b/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc
@@ -34,7 +34,6 @@
 #include "chrome/browser/renderer_host/chrome_navigation_data.h"
 #include "chrome/browser/renderer_host/predictor_resource_throttle.h"
 #include "chrome/browser/renderer_host/safe_browsing_resource_throttle.h"
-#include "chrome/browser/renderer_host/thread_hop_resource_throttle.h"
 #include "chrome/browser/safe_browsing/safe_browsing_service.h"
 #include "chrome/browser/search/search.h"
 #include "chrome/browser/search_engines/template_url_service_factory.h"
@@ -646,9 +645,6 @@ void ChromeResourceDispatcherHostDelegate::AppendStandardResourceThrottles(
     throttles->push_back(new prerender::PrerenderResourceThrottle(request));
   }
 
-  if (ThreadHopResourceThrottle::IsEnabled())
-    throttles->push_back(new ThreadHopResourceThrottle);
-
   std::unique_ptr<PredictorResourceThrottle> predictor_throttle =
       PredictorResourceThrottle::MaybeCreate(request, io_data);
   if (predictor_throttle)