remove unnecessary library names

Fixes generated using `dart fix --code=unnecessary_library_name --apply`

See conversation in https://github.com/dart-lang/lints/issues/181

Change-Id: Id2b975e4aa27348d8883f1aea22e00dd9f4fc493
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/359322
Reviewed-by: Konstantin Shcheglov <[email protected]>
Commit-Queue: Phil Quitslund <[email protected]>

Author: pq

pkg/analyzer/lib/src/summary/base.dart

@@ -3,7 +3,7 @@
 // BSD-style license that can be found in the LICENSE file.
 
 /// Base functionality which code generated summary classes are built upon.
-library analyzer.src.summary.base;
+library;
 
 /// Annotation used in the summary IDL to indicate the id of a field.  The set
 /// of ids used by a class must cover the contiguous range from 0 to N-1, where

pkg/linter/lib/src/util/ascii_utils.dart

@@ -6,7 +6,7 @@
 /// Ultimately we should consider carefully when we use RegExps where a simple
 /// loop would do (and would do so far more performantly).
 /// See: https://github.com/dart-lang/linter/issues/1828
-library ascii_utils;
+library;
 
 import 'charcodes.dart';