yet another fix for dart: with "_"

compiler/java/com/google/dart/compiler/SystemLibraryManager.java

Index: compiler/java/com/google/dart/compiler/SystemLibraryManager.java
===================================================================
--- compiler/java/com/google/dart/compiler/SystemLibraryManager.java	(revision 15465)
+++ compiler/java/com/google/dart/compiler/SystemLibraryManager.java	(working copy)
@@ -94,6 +94,7 @@
   public URI translateDartUri(URI uri) {
    
       String host = uri.getHost();
+      
       SystemLibrary library = hostMap.get(host);
       if (library != null) {
         return library.translateUri(uri);
@@ -101,6 +102,10 @@
       if (host != null) {        
         return libraryProvider.resolveHost(host, uri);
       }
+      String authorithy = uri.getAuthority();
+      if (authorithy != null){
+        return libraryProvider.resolveHost(authorithy, uri);
+      }
       throw new RuntimeException("No system library defined for " + uri);
    
   }