Remove some summary TODOs that have already been addressed.

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

 // Copyright (c) 2015, 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.summary_common;
 
 import 'package:analyzer/analyzer.dart';
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/src/generated/engine.dart';
@@ skipping 2346 matching lines @@
     expect(executable.returnType, isNull);
   }
 
   test_constructor_return_type_parameterized() {
     UnlinkedExecutable executable = findExecutable('',
         executables: serializeClassText('class C<T, U> { C(); }').executables);
     expect(executable.returnType, isNull);
   }
 
   test_dependencies_export_to_export_unused() {
-    // TODO(paulberry): fix this test.
     addNamedSource('/a.dart', 'export "b.dart";');
     addNamedSource('/b.dart', '');
     serializeLibraryText('export "a.dart";');
     // The main test library depends on b.dart, even though it doesn't
     // re-export any names defined in b.dart, because a change to b.dart might
     // cause it to start exporting a name that the main test library *does*
     // use.
     checkHasDependency(absUri('/b.dart'), 'b.dart');
   }
 
   test_dependencies_export_unused() {
-    // TODO(paulberry): fix this test.
     addNamedSource('/a.dart', '');
     serializeLibraryText('export "a.dart";');
     // The main test library depends on a.dart, even though it doesn't
     // re-export any names defined in a.dart, because a change to a.dart might
     // cause it to start exporting a name that the main test library *will*
     // re-export.
     checkHasDependency(absUri('/a.dart'), 'a.dart');
   }
 
   test_dependencies_import_to_export() {
@@ skipping 2282 matching lines @@
  */
 class _PrefixExpectation {
   final ReferenceKind kind;
   final String name;
   final bool inLibraryDefiningUnit;
   final int numTypeParameters;
 
   _PrefixExpectation(this.kind, this.name,
       {this.inLibraryDefiningUnit: false, this.numTypeParameters: 0});
 }