Re-triage mirror test failures on the analyzer.

tests/lib/mirrors/closure_mirror_import1.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+library closure_mirror_import1;
+
 export "closure_mirror_import2.dart" show firstGlobalVariableInImport2;
 
 var globalVariableInImport1 = "globalVariableInImport1";
 
 globalFunctionInImport1() => "globalFunctionInImport1";
 
 class StaticClass {
   static var staticField = "staticField";
 
   static staticFunctionInStaticClass() => "staticFunctionInStaticClass";
 }