[webcrypto] Fix TODO regarding asynchronous completion of crypto operations.

Source/modules/crypto/SubtleCrypto.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 26 matching lines @@
 #include "modules/crypto/CryptoResultImpl.h"
 #include "modules/crypto/Key.h"
 #include "modules/crypto/NormalizeAlgorithm.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebCrypto.h"
 #include "public/platform/WebCryptoAlgorithm.h"
 #include "wtf/ArrayBufferView.h"
 
 namespace WebCore {
 
-// FIXME: asynchronous completion of CryptoResult. Need to re-enter the
-//        v8::Context before trying to fulfill the promise, and enable test.
-
 namespace {
 
 ScriptPromise startCryptoOperation(const Dictionary& rawAlgorithm, Key* key, AlgorithmOperation operationType, ArrayBufferView* signature, ArrayBufferView* dataBuffer, ExceptionState& exceptionState)
 {
     bool requiresKey = operationType != Digest;
 
     // Seems like the generated bindings should take care of these however it
     // currently doesn't. See also http://crbugh.com/264520
     if (requiresKey && !key) {
         exceptionState.throwTypeError("Invalid key argument");
@@ skipping 213 matching lines @@
     unsigned wrappedKeyDataSize = wrappedKey->byteLength();
 
     ScriptPromise promise = ScriptPromise::createPending();
     RefPtr<CryptoResultImpl> result = CryptoResultImpl::create(promise);
     blink::Platform::current()->crypto()->unwrapKey(format, wrappedKeyData, wrappedKeyDataSize, unwrappingKey->key(), unwrapAlgorithm, unwrappedKeyAlgorithm, extractable, keyUsages, result->result());
     return promise;
 }
 
 
 } // namespace WebCore