Deduplicate CopyBytes in modules/crypto

third_party/WebKit/Source/modules/crypto/CryptoUtilities.h

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CryptoUtilities_h
+#define CryptoUtilities_h
+
+#include "core/dom/DOMArrayPiece.h"
+#include "public/platform/WebVector.h"
+
+namespace blink {
+inline WebVector<uint8_t> CopyBytes(const DOMArrayPiece& source) {
+  return WebVector<uint8_t>(static_cast<const uint8_t*>(source.Data()),
+                            source.ByteLength());
+}
+}  // namespace blink
+
+#endif  // CryptoUtilities_h