Don't allow 'abstract' and 'interface' in dart2js anymore

compiler/java/com/google/dart/compiler/resolver/Elements.java

Index: compiler/java/com/google/dart/compiler/resolver/Elements.java
diff --git a/compiler/java/com/google/dart/compiler/resolver/Elements.java b/compiler/java/com/google/dart/compiler/resolver/Elements.java
index 5fadc578d3218d1d457df7b0012f2b4d76d0b144..09bee4f90f43a59f435e72c467f8b1979ea4dfd9 100644
--- a/compiler/java/com/google/dart/compiler/resolver/Elements.java
+++ b/compiler/java/com/google/dart/compiler/resolver/Elements.java
@@ -744,21 +744,6 @@ static FieldElementImplementation fieldFromNode(DartField node,
     }
     return false;
   }
-  
-  /**
-   * @return <code>true</code> if given {@link Source} represents library with given name.
-   */
-  public static boolean isDart2JsLibrarySource(Source source) {
-    if (source instanceof DartSource) {
-      DartSource dartSource = (DartSource) source;
-      LibrarySource library = dartSource.getLibrary();
-      if (library != null) {
-        String libraryName = library.getName();
-        return libraryName.contains("lib/compiler/implementation/");
-      }
-    }
-    return false;
-  }
 
   /**
    * @return <code>true</code> if given {@link Source} represents code library declaration or