Remove unused methods in analysis_server.

pkg/analysis_server/lib/src/services/index/store/codec.dart

Index: pkg/analysis_server/lib/src/services/index/store/codec.dart
diff --git a/pkg/analysis_server/lib/src/services/index/store/codec.dart b/pkg/analysis_server/lib/src/services/index/store/codec.dart
index ec2bb94bd11ec12e2448fb7f3b5c4e3984ef2886..b06ec563bb8dead4a416139a0ee543a88d26f50d 100644
--- a/pkg/analysis_server/lib/src/services/index/store/codec.dart
+++ b/pkg/analysis_server/lib/src/services/index/store/codec.dart
@@ -203,14 +203,6 @@ class ElementCodec {
     return <int>[firstId, lastId];
   }
 
-  static String _getComponentUnit(Element element) {
-    LibraryElement libraryElement = element.library;
-    if (libraryElement == null) {
-      return 'null';
-    }
-    return libraryElement.definingCompilationUnit.source.fullName;
-  }
-
   static bool _hasLocalOffset(List<String> components) {
     for (String component in components) {
       if (component.indexOf('@') != -1) {
@@ -219,14 +211,6 @@ class ElementCodec {
     }
     return false;
   }
-
-  static String _substringBeforeAt(String str) {
-    int atOffset = str.indexOf('@');
-    if (atOffset != -1) {
-      str = str.substring(0, atOffset);
-    }
-    return str;
-  }
 }