Remove all the ephemeral apps code.

extensions/browser/extension_registry.cc

Index: extensions/browser/extension_registry.cc
diff --git a/extensions/browser/extension_registry.cc b/extensions/browser/extension_registry.cc
index 777ebe9fe1bfe28cd7d40b2fd6a946a4e2be1915..9be2e70f4a78d53943718302aec63f384126b28b 100644
--- a/extensions/browser/extension_registry.cc
+++ b/extensions/browser/extension_registry.cc
@@ -75,17 +75,14 @@ void ExtensionRegistry::TriggerOnUnloaded(
 
 void ExtensionRegistry::TriggerOnWillBeInstalled(const Extension* extension,
                                                  bool is_update,
-                                                 bool from_ephemeral,
                                                  const std::string& old_name) {
   CHECK(extension);
   DCHECK_EQ(is_update,
             GenerateInstalledExtensionsSet()->Contains(extension->id()));
   DCHECK_EQ(is_update, !old_name.empty());
-  FOR_EACH_OBSERVER(
-      ExtensionRegistryObserver,
-      observers_,
-      OnExtensionWillBeInstalled(
-          browser_context_, extension, is_update, from_ephemeral, old_name));
+  FOR_EACH_OBSERVER(ExtensionRegistryObserver, observers_,
+                    OnExtensionWillBeInstalled(browser_context_, extension,
+                                               is_update, old_name));
 }
 
 void ExtensionRegistry::TriggerOnInstalled(const Extension* extension,