Remove RTT.derivedTypes and all generated initializations thereof.

compiler/java/com/google/dart/compiler/backend/js/RuntimeTypeInjector.java

Index: compiler/java/com/google/dart/compiler/backend/js/RuntimeTypeInjector.java
diff --git a/compiler/java/com/google/dart/compiler/backend/js/RuntimeTypeInjector.java b/compiler/java/com/google/dart/compiler/backend/js/RuntimeTypeInjector.java
index 6b07ffe256ee6e5a7b943bca62ff04da0a77657e..6d36c6a30fea9a9ca1f7cec69901acb0ffaa32f7 100644
--- a/compiler/java/com/google/dart/compiler/backend/js/RuntimeTypeInjector.java
+++ b/compiler/java/com/google/dart/compiler/backend/js/RuntimeTypeInjector.java
@@ -289,11 +289,6 @@ public class RuntimeTypeInjector {
     //   // interfaces
     //   FooInterface1$addTo(rtt, interface1TypeArg1, ...);
     //
-    //   // fill in derived types
-    //   rtt.derivedTypes = [
-    //      FirstRef$lookupOrCreateRTT(typearg1, ...),
-    //      ...
-    //      ]
     // }
 
     boolean hasTypeParams = classElement.getTypeParameters().size() > 0;
@@ -319,18 +314,6 @@ public class RuntimeTypeInjector {
     }
     body.add(callAddTo.makeStmt());
 
-    // Add the derived types
-
-    if (hasTypeParams) {
-      // Populated the list of derived types
-      JsArrayLiteral derivedTypesArray = new JsArrayLiteral();
-      // TODO(johnlenz): Add needed types here.
-      JsExpression addDerivedTypes = assign(null,
-          nameref(null, rtt.makeRef(), "derivedTypes"),
-          derivedTypesArray);
-      body.add(addDerivedTypes.makeStmt());
-    }
-
     // Finally, Add the function
     JsExpression fnDecl = assign(null,
        getRTTImplementsMethodName(classElement), implementsFn);