diff --git a/tools_webrtc/autoroller/roll_deps.py b/tools_webrtc/autoroller/roll_deps.py
index 4a505b5..77dd7d8 100755
--- a/tools_webrtc/autoroller/roll_deps.py
+++ b/tools_webrtc/autoroller/roll_deps.py
@@ -97,10 +97,6 @@
   pass
 
 
-def StrExpansion():
-  return lambda str_value: str_value
-
-
 def VarLookup(local_scope):
   return lambda var_name: local_scope['vars'][var_name]
 
@@ -108,7 +104,6 @@
 def ParseDepsDict(deps_content):
   local_scope = {}
   global_scope = {
-    'Str': StrExpansion(),
     'Var': VarLookup(local_scope),
     'deps_os': {},
   }