Reland: Remove some dead app host code.

chrome/installer/setup/install.h

 // 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 contains the specification of setup main functions.
 
 #ifndef CHROME_INSTALLER_SETUP_INSTALL_H_
 #define CHROME_INSTALLER_SETUP_INSTALL_H_
 
 #include <vector>
@@ skipping 114 matching lines @@
 // login for each user post system-level Chrome install).
 // |installation_root|: The root of this install (i.e. the directory in which
 // chrome.exe is installed).
 // Shortcut creation is skipped if the First Run beacon is present (unless
 // |force| is set to true).
 // |chrome| The installed product (must be a browser).
 void HandleActiveSetupForBrowser(const base::FilePath& installation_root,
                                  const Product& chrome,
                                  bool force);
 
-// Launches app_host.exe to install content from web store (non-blocking).
-// Returns true on successful execution (although successful installation
-// is not guaranteed).
-bool InstallFromWebstore(const std::string& app_code);
-
 }  // namespace installer
 
 #endif  // CHROME_INSTALLER_SETUP_INSTALL_H_