Revert "Give useful message for null derefs"

runtime/lib/null_patch.dart

Index: runtime/lib/null_patch.dart
diff --git a/runtime/lib/null_patch.dart b/runtime/lib/null_patch.dart
index b3b9f76f4358fa60d4099d4b0b831374ba2aca65..312804e6b84c9dbb8e47654d25fc6f2ccbf62dd3 100644
--- a/runtime/lib/null_patch.dart
+++ b/runtime/lib/null_patch.dart
@@ -14,12 +14,5 @@
   int get hashCode => _HASH_CODE;
   int get _identityHashCode => _HASH_CODE;
 
-  @patch noSuchMethod(Invocation invocation) {
-    String name = internal.Symbol.getName(invocation.memberName);
-    if (invocation.isMethod)
-      throw new NullDereferenceError('$name() was called on a null value.');
-    throw new NullDereferenceError('$name was accessed on a null value.');
-  }
-
   String toString() => 'null';
 }