Remove slow assert from VM.

runtime/vm/assert.h

Index: runtime/vm/assert.h
diff --git a/runtime/vm/assert.h b/runtime/vm/assert.h
deleted file mode 100644
index 7985bc5528f26beff67a9a689842e7b50b054192..0000000000000000000000000000000000000000
--- a/runtime/vm/assert.h
+++ /dev/null
@@ -1,24 +0,0 @@
-// Copyright (c) 2012, 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.
-
-#ifndef VM_ASSERT_H_
-#define VM_ASSERT_H_
-
-#include "platform/assert.h"
-#include "vm/flags.h"
-
-namespace dart {
-
-DECLARE_FLAG(bool, slow_asserts);
-
-// SLOW_ASSERT is used for slow assertion code and disabled by default.
-#if defined(DEBUG)
-#define SLOW_ASSERT(cond) ASSERT(!FLAG_slow_asserts || (cond))
-#else
-#define SLOW_ASSERT(cond)
-#endif
-
-}  // namespace dart
-
-#endif  // VM_ASSERT_H_