[Installer] Cleaning up dead code for App Launcher / App Host installs.

chrome/installer/util/google_chrome_sxs_distribution.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.
 //
 // This file defines implementation of GoogleChromeSxSDistribution.
 
 #include "chrome/installer/util/google_chrome_sxs_distribution.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
@@ skipping 92 matching lines @@
   return true;
 }
 
 bool GoogleChromeSxSDistribution::GetCommandExecuteImplClsid(
     base::string16* handler_class_uuid) {
   if (handler_class_uuid)
     *handler_class_uuid = kCommandExecuteImplUuid;
   return true;
 }
 
-bool GoogleChromeSxSDistribution::AppHostIsSupported() {
-  return false;
-}
-
 bool GoogleChromeSxSDistribution::ShouldSetExperimentLabels() {
   return true;
 }
 
 bool GoogleChromeSxSDistribution::HasUserExperiments() {
   return true;
 }
 
 base::string16 GoogleChromeSxSDistribution::ChannelName() {
   return kChannelName;
 }