Implement MethodMirror.location in the VM.

tests/lib/mirrors/mirrors_reader_test.dart

Index: tests/lib/mirrors/mirrors_reader_test.dart
diff --git a/tests/lib/mirrors/mirrors_reader_test.dart b/tests/lib/mirrors/mirrors_reader_test.dart
index 4cd7b8cfd109cb79dba0caaeef817703d2b120f0..1c69b07928ee73cbf9522572ed53de231b1c20ee 100644
--- a/tests/lib/mirrors/mirrors_reader_test.dart
+++ b/tests/lib/mirrors/mirrors_reader_test.dart
@@ -32,13 +32,17 @@ class RuntimeMirrorsReader extends MirrorsReader {
   bool expectUnsupported(var receiver, String tag, UnsupportedError exception) {
     // [DeclarationMirror.location] is intentionally not supported in runtime
     // mirrors.
-    if (receiver is DeclarationMirror && tag == 'location') {
-      return true;
-    }
+
     if (mirrorSystemType == '_LocalMirrorSystem') {
       // VM mirror system.
+      if (receiver is DeclarationMirror && tag == 'location') {
+        return receiver is! MethodMirror;
+      }
     } else if (mirrorSystemType == 'JsMirrorSystem') {
       // Dart2js runtime mirror system.
+      if (receiver is DeclarationMirror && tag == 'location') {
+        return true;
+      }
     }
     return false;
   }