Remove 'serializeLibrary(LibraryElement)' and its tests.

pkg/analyzer/test/src/summary/summarize_ast_test.dart

 // Copyright (c) 2016, 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 analyzer.test.src.summary.summarize_ast_test;
 
 import 'package:analyzer/analyzer.dart';
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/error/listener.dart';
@@ skipping 119 matching lines @@
  */
 @reflectiveTest
 abstract class LinkedSummarizeAstTest extends SummaryLinkerTest
     with SummaryTest {
   @override
   LinkedLibrary linked;
 
   @override
   List<UnlinkedUnit> unlinkedUnits;
 
+  LinkerInputs linkerInputs;
+
   @override
   bool get checkAstDerivedData => true;
 
   @override
   bool get expectAbsoluteUrisInDependencies => false;
 
   @override
   bool get skipFullyLinkedData => false;
 
   @override
   bool get skipNonConstInitializers => false;
 
   @override
   void serializeLibraryText(String text, {bool allowErrors: false}) {
     Map<String, UnlinkedUnitBuilder> uriToUnit = this._filesToLink.uriToUnit;
-    LinkerInputs linkerInputs = createLinkerInputs(text);
+    linkerInputs = createLinkerInputs(text);
     linked = link(
         linkerInputs.linkedLibraries,
         linkerInputs.getDependency,
         linkerInputs.getUnit,
         (name) => null,
         strongMode)[linkerInputs.testDartUri.toString()];
     expect(linked, isNotNull);
     validateLinkedLibrary(linked);
     unlinkedUnits = <UnlinkedUnit>[linkerInputs.unlinkedDefiningUnit];
     for (String relativeUri
@@ skipping 176 matching lines @@
    * passed to [addNamedSource].
    */
   Map<String, UnlinkedUnitBuilder> uriToUnit = <String, UnlinkedUnitBuilder>{};
 
   /**
    * Information about summaries to be included in the link process.
    */
   SummaryDataStore summaryDataStore =
       new SummaryDataStore([], recordDependencyInfo: true);
 }