Drop extra fields which covered by metadata: isLocal from JsFunction.

js/js.dart-ast/src/com/google/dart/compiler/backend/js/ast/JsFunction.java

@@ -19,7 +19,6 @@ public final class JsFunction extends JsLiteral implements HasName {
     @NotNull
     private final JsFunctionScope scope;
     private JsName name;
-    private boolean isLocal = false;
 
     public JsFunction(@NotNull JsScope parentScope, @NotNull String description) {
         this(parentScope, description, null);
@@ -63,10 +62,6 @@ public final class JsFunction extends JsLiteral implements HasName {
         return scope;
     }
 
-    public boolean isLocal() {
-        return isLocal;
-    }
-
     public void setBody(@NotNull JsBlock body) {
         this.body = body;
     }
@@ -75,10 +70,6 @@ public final class JsFunction extends JsLiteral implements HasName {
         this.name = name;
     }
 
-    public void markAsLocal() {
-        isLocal = true;
-    }
-
     @Override
     public void accept(JsVisitor v) {
         v.visitFunction(this);
@@ -106,7 +97,6 @@ public final class JsFunction extends JsLiteral implements HasName {
         functionCopy.getScope().copyOwnNames(scope);
         functionCopy.setBody(body.deepCopy());
         functionCopy.params = AstUtil.deepCopy(params);
-        functionCopy.isLocal = isLocal;
 
         return functionCopy.withMetadataFrom(this);
     }