[modules] Simplify treatment of empty imports.

test/cctest/test-parsing.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 6156 matching lines @@
   if (entry->export_name->IsOneByteEqualTo("y")) {
     CheckEntry(entry, "y", "x", nullptr, -1);
     entry = (++it)->second;
     CheckEntry(entry, "x", "x", nullptr, -1);
   } else {
     CheckEntry(entry, "x", "x", nullptr, -1);
     entry = (++it)->second;
     CheckEntry(entry, "y", "x", nullptr, -1);
   }
 
-  CHECK_EQ(3, descriptor->special_imports().length());
-  CheckEntry(descriptor->special_imports().at(0), nullptr, nullptr, nullptr, 3);
-  CheckEntry(descriptor->special_imports().at(1), nullptr, "loo", nullptr, 4);
-  CheckEntry(descriptor->special_imports().at(2), nullptr, "foob", nullptr, 4);
+  CHECK_EQ(2, descriptor->namespace_imports().length());
+  CheckEntry(descriptor->namespace_imports().at(0), nullptr, "loo", nullptr, 4);
+  CheckEntry(descriptor->namespace_imports().at(1), nullptr, "foob", nullptr,
+             4);
 
   CHECK_EQ(4, descriptor->regular_imports().size());
   entry = descriptor->regular_imports().find(
       declarations->at(1)->proxy()->raw_name())->second;
   CheckEntry(entry, nullptr, "z", "q", 0);
   entry = descriptor->regular_imports().find(
       declarations->at(2)->proxy()->raw_name())->second;
   CheckEntry(entry, nullptr, "n", "default", 1);
   entry = descriptor->regular_imports().find(
       declarations->at(9)->proxy()->raw_name())->second;
@@ skipping 2137 matching lines @@
     const char* data[] = {
       "const arguments = 1",
       "let arguments",
       "var arguments",
       NULL
     };
     // clang-format on
     RunParserSyncTest(context_data, data, kSuccess);
   }
 }