Remove most of the remaining references to AnalysisContext

pkg/analysis_server/lib/src/domains/analysis/occurrences_dart.dart

 // Copyright (c) 2015, 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 'package:analysis_server/plugin/analysis/occurrences/occurrences_core.dart';
 import 'package:analysis_server/src/protocol_server.dart' as protocol;
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/src/dart/element/element.dart';
 import 'package:analyzer/src/dart/element/member.dart';
-import 'package:analyzer/src/generated/engine.dart';
-import 'package:analyzer/src/generated/source.dart';
 
 void addDartOccurrences(OccurrencesCollector collector, CompilationUnit unit) {
   _DartUnitOccurrencesComputerVisitor visitor =
       new _DartUnitOccurrencesComputerVisitor();
   unit.accept(visitor);
   visitor.elementsOffsets.forEach((engineElement, offsets) {
     int length = engineElement.nameLength;
     protocol.Element serverElement = protocol.convertElement(engineElement);
     protocol.Occurrences occurrences =
         new protocol.Occurrences(serverElement, offsets, length);
     collector.addOccurrences(occurrences);
   });
 }
 
-/**
- * A computer for occurrences in a Dart [CompilationUnit].
- */
-class DartOccurrencesComputer implements OccurrencesContributor {
-  @override
-  void computeOccurrences(
-      OccurrencesCollector collector, AnalysisContext context, Source source) {
-    List<Source> libraries = context.getLibrariesContaining(source);
-    if (libraries.isNotEmpty) {
-      CompilationUnit unit =
-          context.getResolvedCompilationUnit2(source, libraries.first);
-      if (unit != null) {
-        addDartOccurrences(collector, unit);
-      }
-    }
-  }
-}
-
 class _DartUnitOccurrencesComputerVisitor extends RecursiveAstVisitor {
   final Map<Element, List<int>> elementsOffsets = <Element, List<int>>{};
 
   @override
   visitSimpleIdentifier(SimpleIdentifier node) {
     Element element = node.bestElement;
     if (element != null) {
       _addOccurrence(element, node.offset);
     }
     return super.visitSimpleIdentifier(node);
@@ skipping 18 matching lines @@
     }
     if (element is PropertyAccessorElement) {
       element = (element as PropertyAccessorElement).variable;
     }
     if (element is Member) {
       element = (element as Member).baseElement;
     }
     return element;
   }
 }