JS: Remove unneeded forwarding method

Author: asgerf

javascript/extractor/src/com/semmle/js/parser/TypeScriptASTConverter.java

@@ -177,7 +177,7 @@ public class TypeScriptASTConverter {
 
   TypeScriptASTConverter(TypeScriptParserMetadata metadata) {
     this.metadata = metadata;
-    this.syntaxKindExtends = getSyntaxKind("ExtendsKeyword");
+    this.syntaxKindExtends = metadata.getSyntaxKindId("ExtendsKeyword");
   }
 
   /**
@@ -2527,11 +2527,6 @@ private boolean hasFlag(JsonObject node, String flagName) {
     return false;
   }
 
-  /** Gets the numeric value of the syntax kind enum with the given name. */
-  private int getSyntaxKind(String syntaxKind) {
-    return metadata.getSyntaxKindId(syntaxKind);
-  }
-
   /** Check whether a node has a child with a given name. */
   private boolean hasChild(JsonObject node, String prop) {
     if (!node.has(prop)) return false;