Move PackageIndexAssembler into analysis_server.

pkg/analysis_server/lib/src/services/index/index.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.
 
 import 'dart:async';
 
+import 'package:analysis_server/src/services/index/index_unit.dart';
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/src/generated/engine.dart' show AnalysisContext;
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/summary/format.dart';
 import 'package:analyzer/src/summary/idl.dart';
-import 'package:analyzer/src/summary/index_unit.dart';
 import 'package:collection/collection.dart';
 
 /**
  * Return a new [Index] instance that keeps information in memory.
  */
 Index createMemoryIndex() {
   return new Index._();
 }
 
 /**
@@ skipping 606 matching lines @@
           unitUnitUri,
           unitIndex.usedNameKinds[i],
           unitIndex.usedNameOffsets[i],
           name.length,
           unitIndex.usedNameIsQualifiedFlags[i],
           false));
     }
     return locations;
   }
 }