Remove more warnings.

lib/compiler/implementation/tree/nodes.dart

Index: lib/compiler/implementation/tree/nodes.dart
diff --git a/lib/compiler/implementation/tree/nodes.dart b/lib/compiler/implementation/tree/nodes.dart
index c5e27f7e5a586f0551c41d6e3e447b3a8f8240c3..6ecdebe622b2bd8cea38be343d9fbb471a5e9eb9 100644
--- a/lib/compiler/implementation/tree/nodes.dart
+++ b/lib/compiler/implementation/tree/nodes.dart
@@ -1141,7 +1141,7 @@ class Modifiers extends Node {
   bool isExternal() => (flags & FLAG_EXTERNAL) != 0;
 
   /**
-   * Use this to check if the declaration is either explicitly or implicitly 
+   * Use this to check if the declaration is either explicitly or implicitly
    * final.
    */
   bool isFinalOrConst() => isFinal() || isConst();
@@ -1570,7 +1570,6 @@ class ScriptTag extends Node {
   bool isImport() => tag.source == const SourceString("import");
   bool isSource() => tag.source == const SourceString("source");
   bool isLibrary() => tag.source == const SourceString("library");
-  bool isResource() => tag.source == const SourceString("resource");
 
   ScriptTag asScriptTag() => this;