[modules] Simplify treatment of empty imports.

src/ast/modules.cc

Index: src/ast/modules.cc
diff --git a/src/ast/modules.cc b/src/ast/modules.cc
index 6a0f26a89580752df51f2d4aaefe2fea8cda40a1..2d28d5564b546b01ea1b2ab5bd3eb56b6572b379 100644
--- a/src/ast/modules.cc
+++ b/src/ast/modules.cc
@@ -23,19 +23,14 @@ void ModuleDescriptor::AddImport(
 void ModuleDescriptor::AddStarImport(
     const AstRawString* local_name, const AstRawString* module_request,
     Scanner::Location loc, Zone* zone) {
-  DCHECK_NOT_NULL(local_name);
   Entry* entry = new (zone) Entry(loc);
   entry->local_name = local_name;
   entry->module_request = AddModuleRequest(module_request);
-  AddSpecialImport(entry, zone);
+  AddNamespaceImport(entry, zone);
 }
 
-
-void ModuleDescriptor::AddEmptyImport(
-    const AstRawString* module_request, Scanner::Location loc, Zone* zone) {
-  Entry* entry = new (zone) Entry(loc);
-  entry->module_request = AddModuleRequest(module_request);
-  AddSpecialImport(entry, zone);
+void ModuleDescriptor::AddEmptyImport(const AstRawString* module_request) {
+  AddModuleRequest(module_request);
 }