Convert app_launch_index and page_index from int to StringOrdinal.

chrome/browser/extensions/crx_installer.cc

Index: chrome/browser/extensions/crx_installer.cc
diff --git a/chrome/browser/extensions/crx_installer.cc b/chrome/browser/extensions/crx_installer.cc
index 3530d61d931c261535939593ffba046fac400caf..66c6b739b05d085a5ac424139cf15baf7a87db8a 100644
--- a/chrome/browser/extensions/crx_installer.cc
+++ b/chrome/browser/extensions/crx_installer.cc
@@ -132,7 +132,6 @@ CrxInstaller::CrxInstaller(base::WeakPtr<ExtensionService> frontend_weak,
       extensions_enabled_(frontend_weak->extensions_enabled()),
       delete_source_(false),
       create_app_shortcut_(false),
-      page_index_(-1),
       frontend_weak_(frontend_weak),
       profile_(frontend_weak->profile()),
       client_(client),
@@ -587,7 +586,7 @@ void CrxInstaller::ReportSuccessFromUIThread() {
   // Tell the frontend about the installation and hand off ownership of
   // extension_ to it.
   frontend_weak_->OnExtensionInstalled(extension_, is_gallery_install(),
-                                       page_index_);
+                                       page_ordinal_);
 
   NotifyCrxInstallComplete(extension_.get());