pkg/analyzer: Deprecate JavaSystemIO

pkg/analyzer/lib/src/generated/java_io.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 analyzer.src.generated.java_io;
 
 import "dart:io";
 
 import 'package:path/path.dart' as path;
 
@@ skipping 92 matching lines @@
   String toString() => _path.toString();
   Uri toURI() {
     String absolutePath = getAbsolutePath();
     return path.context.toUri(absolutePath);
   }
 
   Directory _newDirectory() => new Directory(_path);
   File _newFile() => new File(_path);
 }
 
+@Deprecated("Only used by `DirectoryBasedDartSdk`, which is also deprecated.")
 class JavaSystemIO {
   static Map<String, String> _properties = new Map();
   static String getenv(String name) => Platform.environment[name];
   static String getProperty(String name) {
     {
       String value = _properties[name];
       if (value != null) {
         return value;
       }
     }
@@ skipping 21 matching lines @@
         }
         // probably be "dart-sdk/bin/dart"
         sdkPath = path.context.dirname(path.context.dirname(exec));
         _properties[name] = sdkPath;
         return sdkPath;
       }
     }
     return null;
   }
 
+  /// Only needed when when using `DirectoryBasedDartSdk`, which is also
+  /// deprecated.
+  ///
+  /// When using `FolderBasedDartSdk`, there is no need to set
+  /// `com.google.dart.sdk`.
+  @deprecated
   static String setProperty(String name, String value) {
     String oldValue = _properties[name];
     _properties[name] = value;
     return oldValue;
   }
 }