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

chrome/installer/util/google_chrome_distribution_dummy.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 dummy implementation of several functions from the
 // BrowserDistribution class for Google Chrome. These functions allow 64-bit
 // Windows Chrome binary to build successfully. Since this binary is only used
 // for Native Client support, most of the install/uninstall functionality is not
 // necessary there.
 
@@ skipping 88 matching lines @@
 
 base::string16 GoogleChromeDistribution::GetIconFilename() {
   return base::string16();
 }
 
 bool GoogleChromeDistribution::GetCommandExecuteImplClsid(
     base::string16* handler_class_uuid) {
   return false;
 }
 
-bool GoogleChromeDistribution::AppHostIsSupported() {
-  return false;
-}
-
 void GoogleChromeDistribution::UpdateInstallStatus(bool system_install,
     installer::ArchiveType archive_type,
     installer::InstallStatus install_status) {
 }
 
 bool GoogleChromeDistribution::ShouldSetExperimentLabels() {
   return false;
 }
 
 bool GoogleChromeDistribution::HasUserExperiments() {
   return false;
 }