disable field trials if the build is 30 days or older

chrome/browser/net/websocket_experiment/websocket_experiment_runner.cc

 // 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.
 
 #include "chrome/browser/net/websocket_experiment/websocket_experiment_runner.h"
 
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/message_loop.h"
 #include "base/metrics/field_trial.h"
@@ skipping 13 matching lines @@
 // Hold reference while experiment is running.
 static scoped_refptr<WebSocketExperimentRunner> runner;
 
 /* static */
 void WebSocketExperimentRunner::Start() {
   DCHECK(!runner.get());
 
   scoped_refptr<base::FieldTrial> trial(
       new base::FieldTrial("WebSocketExperiment", 1000));
   trial->AppendGroup("active", 5);  // 0.5% in active group.
+  trial->AppendGroup("default", base::FieldTrial::kAllRemainingProbability);
 
   bool run_experiment =
       (trial->group() != base::FieldTrial::kNotParticipating);
 #ifndef NDEBUG
   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
   std::string experiment_host = command_line.GetSwitchValueASCII(
       switches::kWebSocketLiveExperimentHost);
   if (!experiment_host.empty())
     run_experiment = true;
 #else
@@ skipping 182 matching lines @@
     Release();
     return;
   }
   task_->SaveResult();
   task_.reset();
 
   DoLoop();
 }
 
 }  // namespace chrome_browser_net_websocket_experiment