extract LibraryMemberContributor from prefixed element contributor

pkg/analysis_server/test/services/completion/prefixed_element_contributor_test.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.
 
 library test.services.completion.invocation;
 
 import 'dart:async';
 
 import 'package:analysis_server/plugin/protocol/protocol.dart';
 import 'package:analysis_server/src/services/completion/dart_completion_manager.dart';
@@ skipping 201 matching lines @@
     return computeFull((bool result) {
       // Suggested by StaticMemberContributor
       assertNotSuggested('instance');
     });
   }
 
   test_libraryPrefix() {
     // SimpleIdentifier  PrefixedIdentifier  ExpressionStatement
     addTestSource('import "dart:async" as bar; foo() {bar.^}');
     return computeFull((bool result) {
-      assertSuggestClass('Future');
+      // Suggested by LibraryMemberContributor
+      assertNotSuggested('Future');
       assertNotSuggested('loadLibrary');
     });
   }
 
   test_libraryPrefix2() {
     // SimpleIdentifier  MethodInvocation  ExpressionStatement
     addTestSource('import "dart:async" as bar; foo() {bar.^ print("f")}');
     return computeFull((bool result) {
-      assertSuggestClass('Future');
+      // Suggested by LibraryMemberContributor
+      assertNotSuggested('Future');
     });
   }
 
   test_libraryPrefix3() {
     // SimpleIdentifier  MethodInvocation  ExpressionStatement
     addTestSource('import "dart:async" as bar; foo() {new bar.F^ print("f")}');
     return computeFull((bool result) {
-      assertSuggestConstructor('Future');
-      assertSuggestConstructor('Future.delayed');
+      // Suggested by LibraryMemberContributor
+      assertNotSuggested('Future');
+      assertNotSuggested('Future.delayed');
     });
   }
 
   test_libraryPrefix_deferred() {
     // SimpleIdentifier  PrefixedIdentifier  ExpressionStatement
     addTestSource('import "dart:async" deferred as bar; foo() {bar.^}');
     return computeFull((bool result) {
-      assertSuggestClass('Future');
-      assertSuggestFunction('loadLibrary', 'Future<dynamic>');
+      // Suggested by LibraryMemberContributor
+      assertNotSuggested('Future');
+      assertNotSuggested('loadLibrary');
     });
   }
 
   test_libraryPrefix_with_exports() {
     addSource('/libA.dart', 'library libA; class A { }');
     addSource('/libB.dart', 'library libB; export "/libA.dart"; class B { }');
     addTestSource('import "/libB.dart" as foo; main() {foo.^} class C { }');
     computeFast();
     return computeFull((bool result) {
-      assertSuggestClass('B');
-      assertSuggestClass('A');
+      // Suggested by LibraryMemberContributor
+      assertNotSuggested('B');
+      assertNotSuggested('A');
     });
   }
 
   test_local() {
     addTestSource('foo() {String x = "bar"; x.^}');
     return computeFull((bool result) {
       assertSuggestGetter('length', 'int');
     });
   }
 
@@ skipping 388 matching lines @@
       assertNotSuggested('ms2');
       assertSuggestInvocationMethod('m', 'C2', null,
           relevance: DART_RELEVANCE_HIGH);
       assertNotSuggested('fi3');
       assertNotSuggested('fs3');
       assertNotSuggested('mi3');
       assertNotSuggested('ms3');
     });
   }
 }