Remove all the ephemeral apps code.

extensions/browser/extension_registry.h

Index: extensions/browser/extension_registry.h
diff --git a/extensions/browser/extension_registry.h b/extensions/browser/extension_registry.h
index 801832ab45d35bfdfe0643e70cca318788476948..1b777b4fd1238deb608df61688081dde9d0268e0 100644
--- a/extensions/browser/extension_registry.h
+++ b/extensions/browser/extension_registry.h
@@ -102,12 +102,8 @@ class ExtensionRegistry : public KeyedService {
   // any installed extension with |extension|'s ID. If this is an update then
   // |is_update| is true and must be an installed extension with |extension|'s
   // ID, and |old_name| must be non-empty.
-  // If true, |from_ephemeral| indicates that the extension was previously
-  // installed ephemerally and has been promoted to a regular installed
-  // extension. |is_update| should also be true.
   void TriggerOnWillBeInstalled(const Extension* extension,
                                 bool is_update,
-                                bool from_ephemeral,
                                 const std::string& old_name);
 
   // Invokes the observer method OnExtensionInstalled(). The extension must be