Insure that isolate specific methods are generated after "inherits"

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

Index: compiler/java/com/google/dart/compiler/backend/js/GenerateJavascriptAST.java
===================================================================
--- compiler/java/com/google/dart/compiler/backend/js/GenerateJavascriptAST.java	(revision 530)
+++ compiler/java/com/google/dart/compiler/backend/js/GenerateJavascriptAST.java	(working copy)
@@ -421,8 +421,6 @@
         }
       }
 
-      maybeInjectIsolateMethods(classElement);
-
       if (classElement.isInterface()) {
         rtt.generateRuntimeTypeInfo(x);
 
@@ -448,6 +446,7 @@
           globalBlock.getStatements().add(inherits.makeStmt());
         }
 
+        maybeInjectIsolateMethods(classElement);
         rtt.generateRuntimeTypeInfo(x);
 
         List<Element> classMembers = new ArrayList<Element>();