Remove all the ephemeral apps code.

chrome/browser/extensions/extension_sync_service.cc

Index: chrome/browser/extensions/extension_sync_service.cc
diff --git a/chrome/browser/extensions/extension_sync_service.cc b/chrome/browser/extensions/extension_sync_service.cc
index 29c6f9069ca52b6639ae923c1ac6bb958597bd1d..42ac91857d18cc51ec5bbaf9b03389e713aff7de 100644
--- a/chrome/browser/extensions/extension_sync_service.cc
+++ b/chrome/browser/extensions/extension_sync_service.cc
@@ -438,12 +438,6 @@ void ExtensionSyncService::ApplySyncData(
       extension_prefs->ReplaceDisableReasons(id, disable_reasons);
   }
 
-  // If the target extension has already been installed ephemerally, it can
-  // be promoted to a regular installed extension and downloading from the Web
-  // Store is not necessary.
-  if (extension && extensions::util::IsEphemeralApp(id, profile_))
-    extension_service()->PromoteEphemeralApp(extension, true);
-
   // Update the incognito flag.
   extensions::util::SetIsIncognitoEnabled(
       id, profile_, extension_sync_data.incognito_enabled());