Revert "Access to imports in the VM's runtime mirrors. Extend test coverage of the source mirrors."

sdk/lib/_internal/lib/js_mirrors.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 dart._js_mirrors;
 
 import 'dart:async';
 
 import 'dart:collection' show
     UnmodifiableListView;
@@ skipping 470 matching lines @@
     return _cachedMetadata =
         new UnmodifiableListView<InstanceMirror>(_metadata.map(reflect));
   }
 
   // TODO(ahe): Test this getter.
   DeclarationMirror get owner => null;
 
   // TODO(ahe): Implement this.
   Function operator [](Symbol name)
       => throw new UnimplementedError();
-
-  List<LibraryDependencyMirror> get libraryDependencies
-      => throw new UnimplementedError();
 }
 
 String n(Symbol symbol) => _symbol_dev.Symbol.getName(symbol);
 
 Symbol s(String name) {
   if (name == null) return null;
   return new _symbol_dev.Symbol.unvalidated(name);
 }
 
 Symbol setterSymbol(Symbol symbol) => s("${n(symbol)}=");
@@ skipping 2318 matching lines @@
   // have a part (following a '.') that starts with '_'.
   const int UNDERSCORE = 0x5f;
   if (name.isEmpty) return true;
   int index = -1;
   do {
     if (name.codeUnitAt(index + 1) == UNDERSCORE) return false;
     index = name.indexOf('.', index + 1);
   } while (index >= 0 && index + 1 < name.length);
   return true;
 }