Disallow packing or loading unpacked manifest v1 extensions.

chrome/browser/ui/webui/extensions/pack_extension_handler.cc

Index: chrome/browser/ui/webui/extensions/pack_extension_handler.cc
diff --git a/chrome/browser/ui/webui/extensions/pack_extension_handler.cc b/chrome/browser/ui/webui/extensions/pack_extension_handler.cc
index 427daddc228fbb4800c756801fd7c186e5e3adf0..1f5f37c9da93089f0bee8db63b5e50d5794d46dc 100644
--- a/chrome/browser/ui/webui/extensions/pack_extension_handler.cc
+++ b/chrome/browser/ui/webui/extensions/pack_extension_handler.cc
@@ -4,10 +4,10 @@
 
 #include "chrome/browser/ui/webui/extensions/pack_extension_handler.h"
 
-#include "chrome/browser/extensions/extension_creator.h"
-#include "chrome/browser/ui/chrome_select_file_policy.h"
 #include "base/bind.h"
 #include "base/utf_string_conversions.h"
+#include "chrome/browser/extensions/extension_creator.h"
+#include "chrome/browser/ui/chrome_select_file_policy.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_view.h"
 #include "content/public/browser/web_ui.h"
@@ -117,7 +117,9 @@ void PackExtensionHandler::HandlePackMessage(const ListValue* args) {
   if (!args->GetDouble(2, &flags_double))
     NOTREACHED();
 
-  int run_flags = static_cast<int>(flags_double);
+  int run_flags =
+      static_cast<int>(flags_double) |
+      extensions::ExtensionCreator::kRequireModernManifestVersion;
 
   FilePath root_directory =
       FilePath::FromWStringHack(UTF8ToWide(extension_path_));