New treatment of native methods.

lib/compiler/implementation/scanner/parser.dart

Index: lib/compiler/implementation/scanner/parser.dart
diff --git a/lib/compiler/implementation/scanner/parser.dart b/lib/compiler/implementation/scanner/parser.dart
index a7899f9cdf61c020b04a3ab7d7c4b4e4fc871b1b..5c7e6aa8b585319b40e800f4a6990453f8f6fdb4 100644
--- a/lib/compiler/implementation/scanner/parser.dart
+++ b/lib/compiler/implementation/scanner/parser.dart
@@ -727,12 +727,12 @@ class Parser {
     }
     Token begin = token;
     int statementCount = 0;
-    listener.beginFunctionBody(begin);
     if (!optional('{', token)) {
       return listener.expectedFunctionBody(token);
-    } else {
-      token = token.next;
     }
+
+    listener.beginFunctionBody(begin);
+    token = token.next;
     while (notEofOrValue('}', token)) {
       token = parseStatement(token);
       ++statementCount;