Clean up warnings.

sdk/lib/_internal/compiler/implementation/mirrors/dart2js_mirror.dart

 // Copyright (c) 2012, 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 mirrors_dart2js;
 
 import 'dart:io';
 import 'dart:uri';
 
 import '../../compiler.dart' as diagnostics;
@@ skipping 177 matching lines @@
   SourceSpan spanFromNode(Node node, [Uri uri]) {
     // TODO(johnniwinther): implement this.
     throw 'unimplemented';
   }
 
   void reportMessage(SourceSpan span, Diagnostic message,
                      diagnostics.Diagnostic kind) {
     // TODO(johnniwinther): implement this.
     throw 'unimplemented';
   }
+
+  void onDeprecatedFeature(Spannable span, String feature) {
+    // TODO(johnniwinther): implement this?
+    throw 'unimplemented';
+  }
 }
 
 //------------------------------------------------------------------------------
 // Compiler extension for apidoc.
 //------------------------------------------------------------------------------
 
 /**
  * Extension of the compiler that enables the analysis of several libraries with
  * no particular entry point.
  */
@@ skipping 165 matching lines @@
     } else {
       packageUri = libraryUri;
     }
     _compiler = new LibraryCompiler(provider, handler,
         libraryUri, packageUri, <String>[]);
     var librariesUri = <Uri>[];
     for (Path library in libraries) {
       librariesUri.add(cwd.resolve(library.toString()));
       // TODO(johnniwinther): Detect file not found
     }
-    _compiler.runList(librariesUri);
+    LibraryCompiler libraryCompiler = _compiler;
+    libraryCompiler.runList(librariesUri);
   }
 
   MirrorSystem get mirrors => new Dart2JsMirrorSystem(_compiler);
 
   Future<String> compileToJavaScript() =>
       new Future<String>.immediate(_compiler.assembledCode);
 }
 
 
 //------------------------------------------------------------------------------
@@ skipping 1151 matching lines @@
     var node = _variable.variables.parseNode(_diagnosticListener);
     if (node != null) {
       var span = mirrors.compiler.spanFromNode(node, script.uri);
       return new Dart2JsSourceLocation(script, span);
     } else {
       var span = mirrors.compiler.spanFromElement(_variable);
       return new Dart2JsSourceLocation(script, span);
     }
   }
 }