dart2js: Fix hints in code base.

pkg/compiler/lib/src/js_emitter/new_emitter/model_emitter.dart

 // Copyright (c) 2014, 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.new_js_emitter.model_emitter;
 
 import '../../constants/values.dart' show ConstantValue, FunctionConstantValue;
 import '../../dart2jslib.dart' show Compiler;
-import '../../dart_types.dart' show DartType;
 import '../../elements/elements.dart' show ClassElement, FunctionElement;
 import '../../js/js.dart' as js;
 import '../../js_backend/js_backend.dart' show
     JavaScriptBackend,
     Namer,
     ConstantEmitter;
 
 import '../js_emitter.dart' show
     NativeEmitter;
 
@@ skipping 451 matching lines @@
     });
   }
 
   js.Template get templateForReadMetadata {
     // TODO(floitsch): make sure that no local variable shadows the access to
     // the readMetadata function.
     return js.js.expressionTemplateFor('$readMetadataName(#)');
   }
 
   List<js.Property> emitMetadata(Program program) {
-    // Unparses all given js-expressions (suitable for `expressionCompile`) and
-    // returns the result in a js-array.
-    // If the given [expressions] is null returns the empty js-array.
-    js.ArrayInitializer unparseExpressions(List<js.Expression> expressions) {
-      if (expressions == null) expressions = <js.Expression>[];
-      List<js.LiteralString> unparsedExpressions = expressions
-          .map((expr) => unparse(compiler, expr, protectForEval: false))
-          .toList();
-      return new js.ArrayInitializer(unparsedExpressions);
-    }
-
     List<js.Property> metadataGlobals = <js.Property>[];
 
     js.Property createGlobal(js.Expression metadata, String global) {
       return new js.Property(js.string(global), metadata);
     }
 
     metadataGlobals.add(createGlobal(program.metadata, METADATA));
     js.Expression types =
         program.metadataTypesForOutputUnit(program.mainFragment.outputUnit);
     metadataGlobals.add(createGlobal(types, TYPES));
@@ skipping 745 matching lines @@
 
   var end = Date.now();
   // print('Setup: ' + (end - start) + ' ms.');
 
   #invokeMain;  // Start main.
 
 }(Date.now(), #code)
 }""";
 
 }