Remove and hide analyzer cli flags.

tools/testing/dart/test_suite.dart

 // Copyright (c) 2012, 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.
 
 /**
  * Classes and methods for enumerating and preparing tests.
  *
  * This library includes:
  *
  * - Creating tests by listing all the Dart files in certain directories,
@@ skipping 1860 matching lines @@
   static String libraryPath(Map configuration) => configuration['use_sdk']
       ? '${TestUtils.buildDir(configuration)}/dart-sdk'
       : 'sdk';
 
   AnalyzeLibraryTestSuite(Map configuration)
       : super(configuration, 'analyze_library', libraryPath(configuration),
             ['lib'], ['tests/lib/analyzer/analyze_library.status']);
 
   List<String> additionalOptions(Path filePath, {bool showSdkWarnings}) {
     var options = super.additionalOptions(filePath);
-    // NOTE: This flag has been deprecated.
-    options.add('--show-sdk-warnings');
+    options.add('--sdk-warnings');
     return options;
   }
 
   bool isTestFile(String filename) {
     // NOTE: We exclude tests and patch files for now.
     return filename.endsWith(".dart") &&
         !filename.endsWith("_test.dart") &&
         !filename.contains("_internal/js_runtime/lib");
   }
 
@@ skipping 528 matching lines @@
       }
       if (path.length > WINDOWS_SHORTEN_PATH_LIMIT) {
         ++shortNameCounter;
         var pathEnd = path.substring(path.length - WINDOWS_PATH_END_LENGTH);
         path = "short${shortNameCounter}_$pathEnd";
       }
     }
     return path;
   }
 }