Remove unused or unneeded stuff from java_core.dart.

pkg/analyzer/lib/src/generated/engine.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.engine;
 
 import 'dart:async';
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
@@ skipping 863 matching lines @@
   }
 
   /**
    * Return `true` if the given [fileName] is assumed to contain Dart source
    * code.
    */
   static bool isDartFileName(String fileName) {
     if (fileName == null) {
       return false;
     }
-    return javaStringEqualsIgnoreCase(
-        FileNameUtilities.getExtension(fileName), SUFFIX_DART);
+    String extension = FileNameUtilities.getExtension(fileName).toLowerCase();
+    return extension == SUFFIX_DART;
   }
 
   /**
    * Return `true` if the given [fileName] is assumed to contain HTML.
    */
   static bool isHtmlFileName(String fileName) {
     if (fileName == null) {
       return false;
     }
-    String extension = FileNameUtilities.getExtension(fileName);
-    return javaStringEqualsIgnoreCase(extension, SUFFIX_HTML) ||
-        javaStringEqualsIgnoreCase(extension, SUFFIX_HTM);
+    String extension = FileNameUtilities.getExtension(fileName).toLowerCase();
+    return extension == SUFFIX_HTML || extension == SUFFIX_HTM;
   }
 }
 
 /**
  * The analysis errors and line information for the errors.
  */
 abstract class AnalysisErrorInfo {
   /**
    * Return the errors that as a result of the analysis, or `null` if there were
    * no errors.
@@ skipping 1568 matching lines @@
    * The data that was created from the source.
    */
   final E data;
 
   /**
    * Initialize a newly created holder to associate the given [data] with the
    * given [modificationTime].
    */
   TimestampedData(this.modificationTime, this.data);
 }