[VM/runtime] Remove unused variable.

TEST=new clang

Change-Id: I8cae607602759f4c4a77a76d4f985ec8d607062a
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/203180
Commit-Queue: Régis Crelier <regis@google.com>
Commit-Queue: Alexander Aprelev <aam@google.com>
Auto-Submit: Régis Crelier <regis@google.com>
Reviewed-by: Alexander Aprelev <aam@google.com>
diff --git a/runtime/vm/compiler/frontend/kernel_translation_helper.cc b/runtime/vm/compiler/frontend/kernel_translation_helper.cc
index 5dddbea..e6c3f73 100644
--- a/runtime/vm/compiler/frontend/kernel_translation_helper.cc
+++ b/runtime/vm/compiler/frontend/kernel_translation_helper.cc
@@ -3426,14 +3426,12 @@
       TypeParameters::Handle(Z, TypeParameters::New(type_parameter_count));
   const Type& null_bound = Type::Handle(Z);
 
-  intptr_t offset = 0;
   if (!parameterized_class.IsNull()) {
     ASSERT(parameterized_class.type_parameters() == TypeParameters::null());
     parameterized_class.set_type_parameters(type_parameters);
   } else {
     ASSERT(parameterized_signature.type_parameters() == TypeParameters::null());
     parameterized_signature.set_type_parameters(type_parameters);
-    offset = parameterized_signature.NumParentTypeArguments();
     if (!function.IsNull()) {
       function.SetNumTypeParameters(type_parameter_count);
     }