Revert "Merge more Kernel infrastructure from kernel_sdk SDK fork."

runtime/bin/common_patch.dart

Index: runtime/bin/common_patch.dart
diff --git a/runtime/bin/common_patch.dart b/runtime/bin/common_patch.dart
index 3e9be62fa2bf1a95ea08c0b915f7733f90510e43..b485dc9a06b625b6f48a5f12e538ccbe98346dee 100644
--- a/runtime/bin/common_patch.dart
+++ b/runtime/bin/common_patch.dart
@@ -2,8 +2,6 @@
 // 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.
 
-import 'dart:nativewrappers';
-
 @patch class _IOCrypto {
   @patch static Uint8List getRandomBytes(int count)
       native "Crypto_GetRandomBytes";
@@ -12,4 +10,4 @@ import 'dart:nativewrappers';
 _setupHooks() {
   VMLibraryHooks.eventHandlerSendData = _EventHandler._sendData;
   VMLibraryHooks.timerMillisecondClock = _EventHandler._timerMillisecondClock;
-}
+}