Made it possible to tell whether an extension is being installed or updated.

apps/shortcut_manager.cc

Index: apps/shortcut_manager.cc
diff --git a/apps/shortcut_manager.cc b/apps/shortcut_manager.cc
index c002100a4602d0d15f9e6c8cb954ee0b77409160..fc2231a850fe446ca3c9cbb3845acbecc2f68d6f 100644
--- a/apps/shortcut_manager.cc
+++ b/apps/shortcut_manager.cc
@@ -34,8 +34,9 @@ void ShortcutManager::Observe(int type,
   switch (type) {
     case chrome::NOTIFICATION_EXTENSION_INSTALLED: {
 #if !defined(OS_MACOSX)
-      const Extension* extension = content::Details<const Extension>(
-          details).ptr();
+      const Extension* extension =
+          content::Details<const extensions::InstalledExtensionInfo>(details)->
+              extension;
       if (extension->is_platform_app() &&
           extension->location() != extensions::Manifest::COMPONENT) {
         web_app::UpdateShortcutInfoAndIconForApp(*extension, profile_,