Don't rename 'call' in dart2dart.

sdk/lib/_internal/compiler/implementation/dart_backend/backend.dart

Index: sdk/lib/_internal/compiler/implementation/dart_backend/backend.dart
diff --git a/sdk/lib/_internal/compiler/implementation/dart_backend/backend.dart b/sdk/lib/_internal/compiler/implementation/dart_backend/backend.dart
index fb1cf881286ffde2d75e8f20c1e1c72b3aef6cf9..4735b7b93f27be852286d6b743c6b199f64e70d3 100644
--- a/sdk/lib/_internal/compiler/implementation/dart_backend/backend.dart
+++ b/sdk/lib/_internal/compiler/implementation/dart_backend/backend.dart
@@ -252,6 +252,9 @@ class DartBackend extends Backend {
         fixedMemberNames.add(element.name.slowToString());
       });
     }
+    // The VM will automatically invoke the call method of objects
+    // that are invoked as functions. Make sure to not rename that.
+    fixedMemberNames.add('call');
     // TODO(antonm): TypeError.srcType and TypeError.dstType are defined in
     // runtime/lib/error.dart. Overall, all DartVM specific libs should be
     // accounted for.