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

chrome/installer/mini_installer/mini_installer.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.
 
 // mini_installer.exe is the first exe that is run when chrome is being
 // installed or upgraded. It is designed to be extremely small (~5KB with no
 // extra resources linked) and it has two main jobs:
 //   1) unpack the resources (possibly decompressing some)
 //   2) run the real installer (setup.exe) with appropriate flags.
 //
@@ skipping 239 matching lines @@
     return true;
   }
 
   // Failing that, look in Chrome Frame's client state key if --chrome-frame was
   // specified.
   if (configuration.has_chrome_frame() && GetSetupExePathForGuidFromRegistry(
           system_level, google_update::kChromeFrameAppGuid, path, size)) {
     return true;
   }
 
-  // Make a last-ditch effort to look in the Chrome and App Host client state
-  // keys.
+  // Make a last-ditch effort to look in the Chrome client state key.
   if (GetSetupExePathForGuidFromRegistry(
           system_level, configuration.chrome_app_guid(), path, size)) {
     return true;
   }
-  if (configuration.has_app_host() && GetSetupExePathForGuidFromRegistry(
-          system_level, google_update::kChromeAppHostAppGuid, path, size)) {
-    return true;
-  }
 
   return false;
 }
 
 // Calls CreateProcess with good default parameters and waits for the process to
 // terminate returning the process exit code. |exit_code|, if non-NULL, is
 // populated with the process exit code.
 bool RunProcessAndWait(const wchar_t* exe_path, wchar_t* cmdline,
                        ProcessExitCode* exit_code) {
   STARTUPINFOW si = {sizeof(si)};
@@ skipping 587 matching lines @@
 #pragma function(memset)
 void* memset(void* dest, int c, size_t count) {
   void* start = dest;
   while (count--) {
     *reinterpret_cast<char*>(dest) = static_cast<char>(c);
     dest = reinterpret_cast<char*>(dest) + 1;
   }
   return start;
 }
 }  // extern "C"