Bug 1628748 - Switch to python3 seems to have broken the Compiler database backend. r=sylvestre

Differential Revision: https://phabricator.services.mozilla.com/D70394

--HG--
extra : moz-landing-system : lando

python/mozbuild/mozbuild/compilation/database.py

@@ -7,7 +7,6 @@
 from __future__ import absolute_import, print_function
 
 import os
-import types
 
 from mozbuild.backend.common import CommonBackend
 from mozbuild.frontend.data import (
@@ -201,7 +200,7 @@ class CompileDBBackend(CommonBackend):
             value = cenv.substs.get(name)
             if not value:
                 return
-            if isinstance(value, types.StringTypes):
+            if isinstance(value, str):
                 value = value.split()
             db.extend(value)