Remove unused analysisContext from completion request and contributors

pkg/analysis_server/test/services/completion/dart/completion_contributor_util.dart

 // Copyright (c) 2014, 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/protocol/protocol_generated.dart';
 import 'package:analysis_server/src/ide_options.dart';
 import 'package:analysis_server/src/provisional/completion/dart/completion_dart.dart';
 import 'package:analysis_server/src/services/completion/completion_core.dart';
@@ skipping 456 matching lines @@
     context.performAnalysisTask();
     // We use a delayed future to allow microtask events to finish. The
     // Future.value or Future() constructors use scheduleMicrotask themselves and
     // would therefore not wait for microtask callbacks that are scheduled after
     // invoking this method.
     return new Future.delayed(
         Duration.ZERO, () => computeLibrariesContaining(times - 1));
   }
 
   Future computeSuggestions({int times = 200, IdeOptions options}) async {
-    AnalysisResult analysisResult = null;
-    if (enableNewAnalysisDriver) {
-      analysisResult = await driver.getResult(testFile);
-      testSource = analysisResult.unit.element.source;
-    } else {
-      context.analysisPriorityOrder = [testSource];
-    }
+    AnalysisResult analysisResult = await driver.getResult(testFile);
+    testSource = analysisResult.unit.element.source;
     CompletionRequestImpl baseRequest = new CompletionRequestImpl(
         analysisResult,
-        enableNewAnalysisDriver ? null : context,
         provider,
         testSource,
         completionOffset,
         new CompletionPerformance(),
         options);
 
     // Build the request
     Completer<DartCompletionRequest> requestCompleter =
         new Completer<DartCompletionRequest>();
     DartCompletionRequestImpl
@@ skipping 124 matching lines @@
       context.computeResult(target, RESOLVED_UNIT);
     }
   }
 
   @override
   void setUp() {
     super.setUp();
     contributor = createContributor();
   }
 }