Convert app_launch_index and page_index from int to StringOrdinal.

chrome/browser/extensions/crx_installer.h

 // 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_CRX_INSTALLER_H_
 #define CHROME_BROWSER_EXTENSIONS_CRX_INSTALLER_H_
 #pragma once
 
 #include <string>
 
@@ skipping 136 matching lines @@
   }
 
   extension_misc::CrxInstallCause install_cause() const {
     return install_cause_;
   }
 
   void set_install_cause(extension_misc::CrxInstallCause install_cause) {
     install_cause_ = install_cause;
   }
 
-  void set_page_index(int page_index) {
+  void set_page_index(std::string page_index) {
     page_index_ = page_index;
   }
 
  private:
   friend class ExtensionUpdaterTest;
 
   virtual ~CrxInstaller();
 
   // Converts the source user script to an extension.
   void ConvertUserScriptOnFileThread();
@@ skipping 70 matching lines @@
   // Whether to create an app shortcut after successful installation. This is
   // set based on the user's selection in the UI and can only ever be true for
   // apps.
   bool create_app_shortcut_;
 
   // The extension we're installing. We own this and either pass it off to
   // ExtensionService on success, or delete it on failure.
   scoped_refptr<const Extension> extension_;
 
   // The index of the NTP apps page |extension_| will be shown on.
-  int page_index_;
+  std::string page_index_;
 
   // A parsed copy of the unmodified original manifest, before any
   // transformations like localization have taken place.
   scoped_ptr<base::DictionaryValue> original_manifest_;
 
   // If non-empty, contains the current version of the extension we're
   // installing (for upgrades).
   std::string current_version_;
 
   // The icon we will display in the installation UI, if any.
@@ skipping 32 matching lines @@
   std::string original_mime_type_;
 
   // What caused this install?  Used only for histograms that report
   // on failure rates, broken down by the cause of the install.
   extension_misc::CrxInstallCause install_cause_;
 
   DISALLOW_COPY_AND_ASSIGN(CrxInstaller);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_CRX_INSTALLER_H_