Delete dart2js specific private library code

tool/input_sdk/private/annotations.dart

Index: tool/input_sdk/private/annotations.dart
diff --git a/tool/input_sdk/private/annotations.dart b/tool/input_sdk/private/annotations.dart
index 5e6cb0552ccd6d48d2ad21bbd407a2dd624389c5..188267e18c20441c5588c2a2e7c602c2d40af20b 100644
--- a/tool/input_sdk/private/annotations.dart
+++ b/tool/input_sdk/private/annotations.dart
@@ -4,13 +4,6 @@
 
 part of _js_helper;
 
-/// Tells the optimizing compiler that the annotated method has no
-/// side-effects.
-/// Requires @NoInline() to function correctly.
-class NoSideEffects {
-  const NoSideEffects();
-}
-
 /// Tells the optimizing compiler that the annotated method cannot throw.
 /// Requires @NoInline() to function correctly.
 class NoThrows {
@@ -22,13 +15,6 @@ class NoInline {
   const NoInline();
 }
 
-// Ensures that the annotated method is represented internally using
-// IR nodes ([:value == true:]) or AST nodes ([:value == false:]).
-class IrRepresentation {
-  final bool value;
-  const IrRepresentation(this.value);
-}
-
 /// Marks a class as native and defines its JavaScript name(s).
 class Native {
   final String name;