Pulling user experiment code from BrowserDistribution to a new class.

chrome/installer/util/chrome_app_host_operations.cc

 // Copyright (c) 2012 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/installer/util/chrome_app_host_operations.h"
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "chrome/common/chrome_switches.h"
@@ skipping 102 matching lines @@
   if (!properties->has_icon())
     properties->set_icon(target_exe, dist->GetIconIndex());
 
   if (!properties->has_app_id()) {
     std::vector<string16> components;
     components.push_back(dist->GetBaseAppId());
     properties->set_app_id(ShellUtil::BuildAppModelId(components));
   }
 }
 
+void ChromeAppHostOperations::LaunchUserExperiment(
+    const base::FilePath& setup_path,
+    const std::set<std::wstring>& options,
+    BrowserDistribution* dist,
+    InstallStatus status,
+    bool system_level) const {
+  NOTREACHED() << "Chrome App Launcher does not launch user experiments.";

[grt (UTC plus 2), 2013/03/12 14:32:18]

please switch to:
  // Explanatory comment.
  NOTREACHED();
here and elsewhere. i am now of the mind that these strings on NOTREACHED() add
no value. thanks.

[huangs, 2013/03/12 18:03:07]

Done.

+}
+
 }  // namespace installer