Cleanup: Use default constructor for WebCryptoKey rather than createNull() factory method.

content/child/webcrypto/generate_key_result.cc

 // 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 "content/child/webcrypto/generate_key_result.h"
 
 #include "base/logging.h"
 
 namespace content {
 
 namespace webcrypto {
 
-GenerateKeyResult::GenerateKeyResult()
-    : type_(TYPE_NULL),
-      secret_key_(blink::WebCryptoKey::createNull()),
-      public_key_(blink::WebCryptoKey::createNull()),
-      private_key_(blink::WebCryptoKey::createNull()) {
+GenerateKeyResult::GenerateKeyResult() : type_(TYPE_NULL) {
 }
 
 GenerateKeyResult::Type GenerateKeyResult::type() const {
   return type_;
 }
 
 const blink::WebCryptoKey& GenerateKeyResult::secret_key() const {
   DCHECK_EQ(TYPE_SECRET_KEY, type_);
   return secret_key_;
 }
@@ skipping 30 matching lines @@
       break;
     case TYPE_PUBLIC_PRIVATE_KEY_PAIR:
       out->completeWithKeyPair(public_key(), private_key());
       break;
   }
 }
 
 }  // namespace webcrypto
 
 }  // namespace content