Remove all the ephemeral apps code.

extensions/browser/test_extension_registry_observer.cc

Index: extensions/browser/test_extension_registry_observer.cc
diff --git a/extensions/browser/test_extension_registry_observer.cc b/extensions/browser/test_extension_registry_observer.cc
index 336c7aa15d3329f77b19c324c20ea5c5da887c70..4fb69440643864341fa2a1a9bc17c44b8e4e9cff 100644
--- a/extensions/browser/test_extension_registry_observer.cc
+++ b/extensions/browser/test_extension_registry_observer.cc
@@ -75,7 +75,6 @@ void TestExtensionRegistryObserver::OnExtensionWillBeInstalled(
     content::BrowserContext* browser_context,
     const Extension* extension,
     bool is_update,
-    bool from_ephemeral,
     const std::string& old_name) {
   if (extension_id_.empty() || extension->id() == extension_id_)
     will_be_installed_waiter_->OnObserved(extension);