Revert 84197 - Add one-time randomization support for FieldTrial, and the ability to

net/socket/client_socket_pool_histograms.cc

Index: net/socket/client_socket_pool_histograms.cc
===================================================================
--- net/socket/client_socket_pool_histograms.cc	(revision 84367)
+++ net/socket/client_socket_pool_histograms.cc	(working copy)
@@ -1,4 +1,4 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2010 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.
 
@@ -58,8 +58,10 @@
 void ClientSocketPoolHistograms::AddRequestTime(base::TimeDelta time) const {
   request_time_->AddTime(time);
 
-  static const bool proxy_connection_impact_trial_exists =
-      base::FieldTrialList::TrialExists("ProxyConnectionImpact");
+  static bool proxy_connection_impact_trial_exists(
+      base::FieldTrialList::Find("ProxyConnectionImpact") &&
+      !base::FieldTrialList::Find("ProxyConnectionImpact")->
+          group_name().empty());
   if (proxy_connection_impact_trial_exists && is_http_proxy_connection_) {
     UMA_HISTOGRAM_CUSTOM_TIMES(
         base::FieldTrial::MakeName("Net.HttpProxySocketRequestTime",