Use std::unique_ptr to pass around WebCryptoDigestor.

third_party/WebKit/Source/platform/Crypto.cpp

 // Copyright 2014 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.
 
 #include "platform/Crypto.h"
 
 #include "public/platform/Platform.h"
 #include "public/platform/WebCrypto.h"
 #include "public/platform/WebCryptoAlgorithm.h"
-#include "wtf/PtrUtil.h"
 #include <memory>
 
 namespace blink {
 
 static WebCryptoAlgorithmId toWebCryptoAlgorithmId(HashAlgorithm algorithm)
 {
     switch (algorithm) {
     case HashAlgorithmSha1:
         return WebCryptoAlgorithmIdSha1;
     case HashAlgorithmSha256:
@@ skipping 10 matching lines @@
 
 bool computeDigest(HashAlgorithm algorithm, const char* digestable, size_t length, DigestValue& digestResult)
 {
     WebCryptoAlgorithmId algorithmId = toWebCryptoAlgorithmId(algorithm);
     WebCrypto* crypto = Platform::current()->crypto();
     unsigned char* result;
     unsigned resultSize;
 
     ASSERT(crypto);
 
-    std::unique_ptr<WebCryptoDigestor> digestor = wrapUnique(crypto->createDigestor(algorithmId));
-    if (!digestor.get() || !digestor->consume(reinterpret_cast<const unsigned char*>(digestable), length) || !digestor->finish(result, resultSize))
+    std::unique_ptr<WebCryptoDigestor> digestor = crypto->createDigestor(algorithmId);
+    DCHECK(digestor);
+    if (!digestor->consume(reinterpret_cast<const unsigned char*>(digestable), length) || !digestor->finish(result, resultSize))
         return false;
 
     digestResult.append(static_cast<uint8_t*>(result), resultSize);
     return true;
 }
 
 std::unique_ptr<WebCryptoDigestor> createDigestor(HashAlgorithm algorithm)
 {
-    return wrapUnique(Platform::current()->crypto()->createDigestor(toWebCryptoAlgorithmId(algorithm)));
+    return Platform::current()->crypto()->createDigestor(toWebCryptoAlgorithmId(algorithm));
 }
 
 void finishDigestor(WebCryptoDigestor* digestor, DigestValue& digestResult)
 {
     unsigned char* result = 0;
     unsigned resultSize = 0;
 
     if (!digestor->finish(result, resultSize))
         return;
 
     ASSERT(result);
 
     digestResult.append(static_cast<uint8_t*>(result), resultSize);
 }
 
 } // namespace blink