Update mojo sdk to rev 3d23dae011859a2aae49f1d1adde705c8e85d819

third_party/mojo/src/mojo/public/dart/src/struct.dart

Index: third_party/mojo/src/mojo/public/dart/src/struct.dart
diff --git a/third_party/mojo/src/mojo/public/dart/src/struct.dart b/third_party/mojo/src/mojo/public/dart/src/struct.dart
index 0111732439562dbbc1e4c45035bb9987a00ec705..d4ac365915939232b04bf929e0570449da79ced3 100644
--- a/third_party/mojo/src/mojo/public/dart/src/struct.dart
+++ b/third_party/mojo/src/mojo/public/dart/src/struct.dart
@@ -4,18 +4,6 @@
 
 part of bindings;
 
-class DataHeader {
-  static const int kHeaderSize = 8;
-  static const int kSizeOffset = 0;
-  static const int kNumFieldsOffset = 4;
-  final int size;
-  final int numFields;
-
-  const DataHeader(this.size, this.numFields);
-
-  String toString() => "DataHeader($size, $numFields)";
-}
-
 abstract class Struct {
   final int encodedSize;