Reorganize tool/input_sdk/private

tool/input_sdk/private/errors.dart

Index: tool/input_sdk/private/errors.dart
diff --git a/tool/input_sdk/private/errors.dart b/tool/input_sdk/private/errors.dart
deleted file mode 100644
index 2225ccafdc27a391fbe39571df550977c45d5fc3..0000000000000000000000000000000000000000
--- a/tool/input_sdk/private/errors.dart
+++ /dev/null
@@ -1,20 +0,0 @@
-// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-part of dart._runtime;
-
-throwCastError(actual, type) => JS('', '''(() => {
-  $throw_(new $CastErrorImplementation($actual, $type));
-})()''');
-
-throwAssertionError() => JS('', '''(() => {
-  $throw_(new $AssertionError());
-})()''');
-
-throwNullValueError() => JS('', '''(() => {
-  // TODO(vsm): Per spec, we should throw an NSM here.  Technically, we ought
-  // to thread through method info, but that uglifies the code and can't
-  // actually be queried ... it only affects how the error is printed.
-  $throw_(new $NoSuchMethodError(null,
-      new $Symbol('<Unexpected Null Value>'), null, null, null));
-})()''');