Reduces output & memory usage of compiler by using prototype chain for inherits

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 44ae3c5c99322b3cd85fc5fd95fda8417479ab7c..b18d6040d9a793b20fd7d114de87b0dbce0e8318 100644
--- a/compiler/java/com/google/dart/compiler/backend/js/RuntimeTypeInjector.java
+++ b/compiler/java/com/google/dart/compiler/backend/js/RuntimeTypeInjector.java
@@ -157,9 +157,8 @@ public class RuntimeTypeInjector {
     // implementation works properly.
     interfaces.add(classElement.getType());
 
-    for (InterfaceType current = classElement.getType(); current != null;
-      current = current.getElement().getSupertype()) {
-      // TODO(johnlenz): Maybe use "getAllSupertypes" on the interface element instead
+   InterfaceType current = classElement.getType();
+   if (current != null) {
       addAllInterfaces(interfaces, current);
     }
     return interfaces;