dart2js: use IdGenerator for all id generation

pkg/compiler/lib/src/patch_parser.dart

Index: pkg/compiler/lib/src/patch_parser.dart
diff --git a/pkg/compiler/lib/src/patch_parser.dart b/pkg/compiler/lib/src/patch_parser.dart
index 0e9943d481191eeeb7a5cc77eb2b7f33ce03a6fe..c95cde7cc447170202f10e08eddb443436e303e3 100644
--- a/pkg/compiler/lib/src/patch_parser.dart
+++ b/pkg/compiler/lib/src/patch_parser.dart
@@ -177,8 +177,8 @@ class PatchParserTask extends CompilerTask {
       // TODO(johnniwinther): Test that parts and exports are handled correctly.
       Script script = compilationUnit.script;
       Token tokens = new Scanner(script.file).tokenize();
-      Listener patchListener =
-          new PatchElementListener(compiler, compilationUnit, compiler);
+      Listener patchListener = new PatchElementListener(
+          compiler, compilationUnit, compiler.idGenerator);
       try {
         new PartialParser(patchListener, parserOptions).parseUnit(tokens);
       } on ParserError catch (e) {