remove PLT.BeginToFinish{,Doc}_AfterPreconnectRequest

chrome/renderer/page_load_histograms.cc

Index: chrome/renderer/page_load_histograms.cc
diff --git a/chrome/renderer/page_load_histograms.cc b/chrome/renderer/page_load_histograms.cc
index 588df0732d069d0e3d7cb1821114652deabbadfb..307fe4dbb2bd7e99b7a5205106f3919c5ecbfaf4 100644
--- a/chrome/renderer/page_load_histograms.cc
+++ b/chrome/renderer/page_load_histograms.cc
@@ -628,12 +628,6 @@ void DumpDeprecatedHistograms(const WebPerformance& performance,
     PLT_HISTOGRAM("PLT.BeginToFinish_ContentPrefetcherReferrer",
                   begin_to_finish_all_loads);
   }
-  if (document_state->was_after_preconnect_request()) {
-    PLT_HISTOGRAM("PLT.BeginToFinishDoc_AfterPreconnectRequest",
-                  begin_to_finish_doc);
-    PLT_HISTOGRAM("PLT.BeginToFinish_AfterPreconnectRequest",
-                  begin_to_finish_all_loads);
-  }
 
   const bool use_webrequest_histogram =
       ChromeContentRendererClient::WasWebRequestUsedBySomeExtensions();