Small refactoring in app_search_provider.

If wrong notification is received, NOTREACHED() is called.

BUG=None
R=benwells@chromium.org

Review URL: https://codereview.chromium.org/263833019

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@269604 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/ui/app_list/search/app_search_provider.cc

@@ -105,7 +105,14 @@ void AppSearchProvider::RefreshApps() {
 void AppSearchProvider::Observe(int type,
                                 const content::NotificationSource& source,
                                 const content::NotificationDetails& detaila) {
-  RefreshApps();
+  switch (type) {
+    case chrome::NOTIFICATION_EXTENSION_LOADED_DEPRECATED:
+    case chrome::NOTIFICATION_EXTENSION_UNINSTALLED:
+      RefreshApps();
+      break;
+    default:
+      NOTREACHED();
+  }
 }
 
 }  // namespace app_list