Generate all extension schema namespaces as "api" and instead vary the generated bundle names.

extensions/browser/api/vpn_provider/vpn_service.h

Index: extensions/browser/api/vpn_provider/vpn_service.h
diff --git a/extensions/browser/api/vpn_provider/vpn_service.h b/extensions/browser/api/vpn_provider/vpn_service.h
index 72c62406daceabee75df8c945129fc63b254bc57..12b28b1775ab9fc1ae213bb7d714391f8c805319 100644
--- a/extensions/browser/api/vpn_provider/vpn_service.h
+++ b/extensions/browser/api/vpn_provider/vpn_service.h
@@ -143,7 +143,7 @@ class VpnService : public KeyedService,
   // Calls |success| or |failure| based on the outcome.
   void NotifyConnectionStateChanged(
       const std::string& extension_id,
-      extensions::core_api::vpn_provider::VpnConnectionState state,
+      extensions::api::vpn_provider::VpnConnectionState state,
       const SuccessCallback& success,
       const FailureCallback& failure);