Remove some dead app host code.

chrome/installer/launcher_support/chrome_launcher_support.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.
 
 #ifndef CHROME_INSTALLER_LAUNCHER_SUPPORT_CHROME_LAUNCHER_SUPPORT_H_
 #define CHROME_INSTALLER_LAUNCHER_SUPPORT_CHROME_LAUNCHER_SUPPORT_H_
 
 namespace base {
 class FilePath;
 }
 
 namespace chrome_launcher_support {
 
 enum InstallationLevel {
   USER_LEVEL_INSTALLATION,
   SYSTEM_LEVEL_INSTALLATION,
 };
 
-enum InstallationState {
-  NOT_INSTALLED,
-  INSTALLED_AT_USER_LEVEL,
-  INSTALLED_AT_SYSTEM_LEVEL,
-};
-
-// The app GUID for Chrome App Launcher.
-extern const wchar_t kAppLauncherGuid[];
-
 // Returns the path to an existing setup.exe at the specified level, if it can
 // be found via Omaha client state.
 base::FilePath GetSetupExeForInstallationLevel(InstallationLevel level);
 
 // Returns the path to an installed chrome.exe at the specified level, if it can
 // be found via Omaha client state. Prefers the installer from a multi-install,
 // but may also return that of a single-install of Chrome if no multi-install
 // exists.
 base::FilePath GetChromePathForInstallationLevel(InstallationLevel level);
 
-// Returns the path to an installed app_host.exe at the specified level, if
-// it can be found via Omaha client state.
-base::FilePath GetAppHostPathForInstallationLevel(InstallationLevel level);
-
 // Returns the path to an installed SxS chrome.exe at the specified level, if
 // it can be found via Omaha client state.
 base::FilePath GetChromeSxSPathForInstallationLevel(InstallationLevel level);
 
 // Returns the path to an installed chrome.exe, or an empty path. Prefers a
 // system-level installation to a user-level installation. Uses Omaha client
 // state to identify a Chrome installation location.
 // The file path returned (if any) is guaranteed to exist.
 base::FilePath GetAnyChromePath();
 
-// Returns the path to an installed app_host.exe, or an empty path. Prefers a
-// system-level installation to a user-level installation. Uses Omaha client
-// state to identify a App Host installation location.
-// The file path returned (if any) is guaranteed to exist.
-base::FilePath GetAnyAppHostPath();
-
 // Returns the path to an installed SxS chrome.exe, or an empty path. Prefers a
 // user-level installation to a system-level installation. Uses Omaha client
 // state to identify a Chrome Canary installation location.
 // The file path returned (if any) is guaranteed to exist.
 base::FilePath GetAnyChromeSxSPath();
 
-// Uninstalls the legacy app launcher by launching setup.exe with the uninstall
-// arguments from the App Launcher ClientState registry key. The uninstall will
-// run asynchronously.
-void UninstallLegacyAppLauncher(InstallationLevel level);
-
-// Returns true if App Host is installed (system-level or user-level),
-// or in the same directory as the current executable.
-bool IsAppHostPresent();
-
-// Returns the app launcher installation state. If the launcher is installed
-// at both system level and user level, system level is returned.
-InstallationState GetAppLauncherInstallationState();
-
-// Returns true if App Launcher is installed (system-level or user-level).
-bool IsAppLauncherPresent();
-
 // Returns true if the Chrome browser is installed (system-level or user-level).
 // If this is running in an official build, it will check if a non-canary build
 // if installed. If it is not an official build, it will always return true.
 bool IsChromeBrowserPresent();
 
 }  // namespace chrome_launcher_support
 
 #endif  // CHROME_INSTALLER_LAUNCHER_SUPPORT_CHROME_LAUNCHER_SUPPORT_H_