Revert 148046 - Revert 147650 - Implement installation of the Chrome App Host.

chrome/installer/setup/install.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.
 
 #include "chrome/installer/setup/install.h"
 
 #include <shlobj.h>
 #include <time.h>
 #include <winuser.h>
 
@@ skipping 409 matching lines @@
     const FilePath& archive_path,
     const FilePath& install_temp_path,
     const FilePath& prefs_path,
     const MasterPreferences& prefs,
     const Version& new_version) {
   FilePath src_path(install_temp_path);
   src_path = src_path.Append(kInstallSourceDir).Append(kInstallSourceChromeDir);
 
   // TODO(robertshield): Removing the pending on-reboot moves should be done
   // elsewhere.
+  // TODO(erikwright): Understand why this is Chrome Frame only and whether
+  // it also applies to App Host. Shouldn't it apply to any multi-install too?
   const Products& products = installer_state.products();
   DCHECK(products.size());
   if (installer_state.FindProduct(BrowserDistribution::CHROME_FRAME)) {
     // Make sure that we don't end up deleting installed files on next reboot.
     if (!RemoveFromMovesPendingReboot(
             installer_state.target_path().value().c_str())) {
       LOG(ERROR) << "Error accessing pending moves value.";
     }
   }
 
@@ skipping 104 matching lines @@
     installer_state.RemoveOldVersionDirectories(
         new_version,
         existing_version.get(),
         install_temp_path);
   }
 
   return result;
 }
 
 }  // namespace installer