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

chrome/browser/chromeos/enterprise_extension_observer.cc

Index: chrome/browser/chromeos/enterprise_extension_observer.cc
diff --git a/chrome/browser/chromeos/enterprise_extension_observer.cc b/chrome/browser/chromeos/enterprise_extension_observer.cc
index add3b7f8ea9e636a86f2d21784521dfce61ac235..f34632e2e648c713fe5e5fd2e9112efa8c598882 100644
--- a/chrome/browser/chromeos/enterprise_extension_observer.cc
+++ b/chrome/browser/chromeos/enterprise_extension_observer.cc
@@ -34,8 +34,9 @@ void EnterpriseExtensionObserver::Observe(
   if (content::Source<Profile>(source).ptr() != profile_) {
     return;
   }
-  extensions::Extension* extension =
-      content::Details<extensions::Extension>(details).ptr();
+  const extensions::Extension* extension =
+      content::Details<const extensions::InstalledExtensionInfo>(details)->
+          extension;
   if (extension->location() !=
       extensions::Manifest::EXTERNAL_POLICY_DOWNLOAD) {
     return;