extract LocalLibraryContributor from imported reference contributor

pkg/analysis_server/test/services/completion/completion_test_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.
 
 library test.services.completion.util;
 
 import 'dart:async';
 
 import 'package:analysis_server/plugin/protocol/protocol.dart' as protocol
     show Element, ElementKind;
@@ skipping 3735 matching lines @@
       main() {new ^}''');
     computeFast();
     return computeFull((bool result) {
       expect(request.replacementOffset, completionOffset);
       expect(request.replacementLength, 0);
       // Suggested by ConstructorContributor
       assertNotSuggested('B.bar');
       assertSuggestImportedConstructor('Object');
       assertSuggestImportedConstructor('X.c');
       assertNotSuggested('X._d');
-      assertSuggestImportedConstructor('A');
+      // Suggested by LocalLibraryContributor
+      assertNotSuggested('A');
       assertNotSuggested('F1');
       assertNotSuggested('T1');
       assertNotSuggested('_d');
       assertNotSuggested('z');
       assertNotSuggested('m');
     });
   }
 
   test_partFile_TypeName2() {
     // SimpleIdentifier  TypeName  ConstructorName
@@ skipping 18 matching lines @@
       var m;''');
     computeFast();
     return computeFull((bool result) {
       expect(request.replacementOffset, completionOffset);
       expect(request.replacementLength, 0);
       // Suggested by ConstructorContributor
       assertNotSuggested('A');
       assertSuggestImportedConstructor('Object');
       assertSuggestImportedConstructor('X.c');
       assertNotSuggested('X._d');
-      assertSuggestImportedConstructor('B');
+      // Suggested by LocalLibraryContributor
+      assertNotSuggested('B');
       assertNotSuggested('F1');
       assertNotSuggested('T1');
       assertNotSuggested('_d');
       assertNotSuggested('z');
       assertNotSuggested('m');
     });
   }
 
   test_PrefixedIdentifier_class_const() {
     // SimpleIdentifier PrefixedIdentifier ExpressionStatement Block
@@ skipping 861 matching lines @@
       assertNotSuggested('bar2');
       assertNotSuggested('_B');
       assertSuggestLocalClass('Y');
       assertSuggestLocalClass('C');
       assertSuggestLocalVariable('f', null);
       assertNotSuggested('x');
       assertNotSuggested('e');
     });
   }
 }