Convert app_launch_index and page_index from int to StringOrdinal.

chrome/browser/extensions/crx_installer.cc

 // Copyright (c) 2011 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/browser/extensions/crx_installer.h"
 
 #include <map>
 #include <set>
 
 #include "base/file_util.h"
@@ skipping 103 matching lines @@
 }
 
 CrxInstaller::CrxInstaller(base::WeakPtr<ExtensionService> frontend_weak,
                            ExtensionInstallUI* client)
     : install_directory_(frontend_weak->install_directory()),
       install_source_(Extension::INTERNAL),
       extensions_enabled_(frontend_weak->extensions_enabled()),
       delete_source_(false),
       is_gallery_install_(false),
       create_app_shortcut_(false),
-      page_index_(-1),
+      page_index_(extension_misc::kUnsetIndex),
       frontend_weak_(frontend_weak),
       client_(client),
       apps_require_extension_mime_type_(false),
       allow_silent_install_(false),
       install_cause_(extension_misc::INSTALL_CAUSE_UNSET) {
 }
 
 CrxInstaller::~CrxInstaller() {
   // Delete the temp directory and crx file as necessary. Note that the
   // destructor might be called on any thread, so we post a task to the file
@@ skipping 451 matching lines @@
   // Some users (such as the download shelf) need to know when a
   // CRXInstaller is done.  Listening for the EXTENSION_* events
   // is problematic because they don't know anything about the
   // extension before it is unpacked, so they can not filter based
   // on the extension.
   NotificationService::current()->Notify(
       chrome::NOTIFICATION_CRX_INSTALLER_DONE,
       Source<CrxInstaller>(this),
       NotificationService::NoDetails());
 }