Rename ClosureClassMaps to ClosureDataLookup

tests/compiler/dart2js/memory_compiler.dart

 // Copyright (c) 2016, 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 dart2js.test.memory_compiler;
 
 import 'dart:async';
 
 import 'package:compiler/compiler.dart' show DiagnosticHandler;
 import 'package:compiler/compiler_new.dart'
@@ skipping 185 matching lines @@
 
     // One potential problem that can occur when reusing elements is that there
     // is a stale reference to an old compiler object.  By nulling out the old
     // compiler's fields, such stale references are easier to identify.
     cachedCompiler.scanner = null;
     cachedCompiler.dietParser = null;
     cachedCompiler.parser = null;
     cachedCompiler.patchParser = null;
     cachedCompiler.libraryLoader = null;
     cachedCompiler.resolver = null;
-    cachedCompiler.closureToClassMapper = null;
+    cachedCompiler.closureDataLookup = null;
     cachedCompiler.checker = null;
     cachedCompiler.globalInference = null;
     cachedCompiler.backend = null;
     // Don't null out the enqueuer as it prevents us from using cachedCompiler
     // more than once.
     cachedCompiler.deferredLoadTask = null;
     cachedCompiler.mirrorUsageAnalyzerTask = null;
     cachedCompiler.dumpInfoTask = null;
   }
   return compiler;
@@ skipping 33 matching lines @@
       handler = (Uri uri, int begin, int end, String message, Diagnostic kind) {
         diagnosticHandler(uri, begin, end, message, kind);
         formattingHandler(uri, begin, end, message, kind);
       };
     }
   } else if (diagnosticHandler == null) {
     handler = (Uri uri, int begin, int end, String message, Diagnostic kind) {};
   }
   return handler;
 }