Enable side-by-side beta and dev channels.

chrome/installer/mini_installer/configuration.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/mini_installer/configuration.h"
 
 #include <windows.h>
 #include <shellapi.h>  // NOLINT
 #include <stddef.h>
 
@@ skipping 57 matching lines @@
 bool Configuration::ParseCommandLine(const wchar_t* command_line) {
   command_line_ = command_line;
   args_ = ::CommandLineToArgvW(command_line_, &argument_count_);
   if (!args_)
     return false;
 
   for (int i = 1; i < argument_count_; ++i) {
     if (0 == ::lstrcmpi(args_[i], L"--system-level"))
       is_system_level_ = true;
 #if defined(GOOGLE_CHROME_BUILD)
+    else if (0 == ::lstrcmpi(args_[i], L"--chrome-beta"))
+      chrome_app_guid_ = google_update::kBetaAppGuid;
+    else if (0 == ::lstrcmpi(args_[i], L"--chrome-dev"))
+      chrome_app_guid_ = google_update::kDevAppGuid;
     else if (0 == ::lstrcmpi(args_[i], L"--chrome-sxs"))
       chrome_app_guid_ = google_update::kSxSAppGuid;
 #endif
     else if (0 == ::lstrcmpi(args_[i], L"--cleanup"))
       operation_ = CLEANUP;
     else if (0 == ::lstrcmpi(args_[i], L"--chrome-frame"))
       has_invalid_switch_ = true;
   }
 
   if (!is_system_level_)
@@ skipping 52 matching lines @@
               ERROR_SUCCESS &&
           key.ReadSZValue(kUninstallArgumentsRegistryValue, value.get(),
                           value.capacity()) == ERROR_SUCCESS &&
           value.findi(L"--multi-install") != nullptr);
 #else
   return false;
 #endif
 }
 
 }  // namespace mini_installer