Allow invocation of --multi-install without a product if App Host needs binaries.

chrome/installer/util/installer_state.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/util/installer_state.h"
 
 #include <algorithm>
 #include <functional>
 #include <utility>
 
@@ skipping 237 matching lines @@
     operation_ = SINGLE_INSTALL_OR_UPDATE;
   } else if (IsMultiInstallUpdate(prefs, machine_state)) {
     // Updates driven by Google Update take place under the multi-installer's
     // app guid.
     operand = multi_package_distribution_;
     operation_ = MULTI_UPDATE;
   } else {
     operation_ = MULTI_INSTALL;
   }
 
-  // Initial, over, and un-installs will always take place under one of the
-  // product app guids (Chrome, Chrome Frame, or App Host, in order of
+  // Initial, over, and un-installs will take place under one of the
+  // product app guids (Chrome, Chrome Frame, App Host, or Binaries, in order of
   // preference).
   if (operand == NULL) {
     BrowserDistribution::Type operand_distribution_type =
         BrowserDistribution::CHROME_BINARIES;
     if (prefs.install_chrome())
       operand_distribution_type = BrowserDistribution::CHROME_BROWSER;
     else if (prefs.install_chrome_frame())
       operand_distribution_type = BrowserDistribution::CHROME_FRAME;
     else if (prefs.install_chrome_app_host())
       operand_distribution_type = BrowserDistribution::CHROME_APP_HOST;
-    else
-      NOTREACHED();
 
     operand = BrowserDistribution::GetSpecificDistribution(
         operand_distribution_type);
   }
 
   state_key_ = operand->GetStateKey();
   state_type_ = operand->GetType();
 
   // Parse --critical-update-version=W.X.Y.Z
   std::string critical_version_value(
@@ skipping 455 matching lines @@
   if (is_multi_install()) {
     InstallUtil::AddInstallerResultItems(
         system_install, multi_package_binaries_distribution()->GetStateKey(),
         status, string_resource_id, launch_cmd, install_list.get());
   }
   if (!install_list->Do())
     LOG(ERROR) << "Failed to record installer error information in registry.";
 }
 
 }  // namespace installer