Remove more references to AnalysisContext

pkg/analysis_server/lib/src/services/completion/statement/statement_completion.dart

 // Copyright (c) 2017, 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 'dart:math';
 
 import 'package:analysis_server/src/protocol_server.dart' hide Element;
 import 'package:analysis_server/src/services/correction/source_buffer.dart';
 import 'package:analysis_server/src/services/correction/util.dart';
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/error/error.dart';
 import 'package:analyzer/error/error.dart' as engine;
 import 'package:analyzer/src/dart/ast/utilities.dart';
 import 'package:analyzer/src/dart/error/hint_codes.dart';
 import 'package:analyzer/src/dart/error/syntactic_errors.dart';
 import 'package:analyzer/src/error/codes.dart';
-import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/java_core.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer_plugin/utilities/range_factory.dart';
 
 /**
  * An enumeration of possible statement completion kinds.
  */
 class DartStatementCompletion {
   static const NO_COMPLETION =
       const StatementCompletionKind('No_COMPLETION', 'No completion available');
@@ skipping 96 matching lines @@
 }
 
 /**
  * The computer for Dart statement completions.
  */
 class StatementCompletionProcessor {
   static final NO_COMPLETION = new StatementCompletion(
       DartStatementCompletion.NO_COMPLETION, new SourceChange("", edits: []));
 
   final StatementCompletionContext statementContext;
-  final AnalysisContext analysisContext;
   final CorrectionUtils utils;
-  int fileStamp;
   AstNode node;
   StatementCompletion completion;
   SourceChange change = new SourceChange('statement-completion');
   List errors = <engine.AnalysisError>[];
   final Map<String, LinkedEditGroup> linkedPositionGroups =
       <String, LinkedEditGroup>{};
   Position exitPosition = null;
 
   StatementCompletionProcessor(this.statementContext)
-      : analysisContext = statementContext.unitElement.context,
-        utils = new CorrectionUtils(statementContext.unit) {
-    fileStamp = analysisContext.getModificationStamp(source);
-  }
+      : utils = new CorrectionUtils(statementContext.unit);
 
   String get eol => utils.endOfLine;
 
   String get file => statementContext.file;
 
   LineInfo get lineInfo => statementContext.lineInfo;
 
   int get requestLine => lineInfo.getLocation(selectionOffset).lineNumber;
 
   int get selectionOffset => statementContext.selectionOffset;
 
   Source get source => statementContext.unitElement.source;
 
   CompilationUnit get unit => statementContext.unit;
 
   CompilationUnitElement get unitElement => statementContext.unitElement;
 
   Future<StatementCompletion> compute() async {
-    // If the source was changed between the constructor and running
-    // this asynchronous method, it is not safe to use the unit.
-    if (analysisContext.getModificationStamp(source) != fileStamp) {
-      return NO_COMPLETION;
-    }
     node = _selectedNode();
     if (node == null) {
       return NO_COMPLETION;
     }
     node = node
         .getAncestor((n) => n is Statement || _isNonStatementDeclaration(n));
     if (node == null) {
       return _complete_simpleEnter() ? completion : NO_COMPLETION;
     }
     if (node is Block) {
@@ skipping 1053 matching lines @@
   final Token keyword;
   final Token leftParenthesis, rightParenthesis;
   final Expression condition;
   final Statement block;
 
   _KeywordConditionBlockStructure(this.keyword, this.leftParenthesis,
       this.condition, this.rightParenthesis, this.block);
 
   int get offset => keyword.offset;
 }