[strong] Remove all remainders of strong mode

src/runtime/runtime-internal.cc

Index: src/runtime/runtime-internal.cc
diff --git a/src/runtime/runtime-internal.cc b/src/runtime/runtime-internal.cc
index 34b844a8984aa9dbbc1ec17e7d48e9b9f633079c..22b06ed005711451c0d43e4c9f58980c10bca957 100644
--- a/src/runtime/runtime-internal.cc
+++ b/src/runtime/runtime-internal.cc
@@ -171,14 +171,6 @@ RUNTIME_FUNCTION(Runtime_ThrowIteratorResultNotAnObject) {
 }
 
 
-RUNTIME_FUNCTION(Runtime_ThrowStrongModeImplicitConversion) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 0);
-  THROW_NEW_ERROR_RETURN_FAILURE(
-      isolate, NewTypeError(MessageTemplate::kStrongImplicitConversion));
-}
-
-
 RUNTIME_FUNCTION(Runtime_ThrowApplyNonFunction) {
   HandleScope scope(isolate);
   DCHECK_EQ(1, args.length());