Remove unused or unneeded stuff from java_core.dart.

pkg/analyzer/lib/src/generated/engine.dart

Index: pkg/analyzer/lib/src/generated/engine.dart
diff --git a/pkg/analyzer/lib/src/generated/engine.dart b/pkg/analyzer/lib/src/generated/engine.dart
index 2e1d9f051b1ad42b8e3188cea76989e95dbba4e8..c3aa019682040d09d0ed90af2caeb87aaa47d499 100644
--- a/pkg/analyzer/lib/src/generated/engine.dart
+++ b/pkg/analyzer/lib/src/generated/engine.dart
@@ -881,8 +881,8 @@ class AnalysisEngine {
     if (fileName == null) {
       return false;
     }
-    return javaStringEqualsIgnoreCase(
-        FileNameUtilities.getExtension(fileName), SUFFIX_DART);
+    String extension = FileNameUtilities.getExtension(fileName).toLowerCase();
+    return extension == SUFFIX_DART;
   }
 
   /**
@@ -892,9 +892,8 @@ class AnalysisEngine {
     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;
   }
 }