Add V8ObjectBuilder helper and use in modules/crypto/

Source/modules/crypto/CryptoResultImpl.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 164 matching lines @@
         m_resolver->resolve(CryptoKey::create(key));
     clearResolver();
 }
 
 void CryptoResultImpl::completeWithKeyPair(const WebCryptoKey& publicKey, const WebCryptoKey& privateKey)
 {
     if (m_resolver) {
         ScriptState* scriptState = m_resolver->scriptState();
         ScriptState::Scope scope(scriptState);
 
-        Dictionary keyPair = Dictionary::createEmpty(scriptState->isolate());
+        V8ObjectBuilder keyPair(scriptState);
 
-        v8::Handle<v8::Value> publicKeyValue = toV8(CryptoKey::create(publicKey), scriptState->context()->Global(), scriptState->isolate());
-        v8::Handle<v8::Value> privateKeyValue = toV8(CryptoKey::create(privateKey), scriptState->context()->Global(), scriptState->isolate());
-
-        keyPair.set("publicKey", publicKeyValue);
-        keyPair.set("privateKey", privateKeyValue);
+        keyPair.add("publicKey", ScriptValue::from(scriptState, CryptoKey::create(publicKey)));
+        keyPair.add("privateKey", ScriptValue::from(scriptState, CryptoKey::create(privateKey)));
 
         m_resolver->resolve(keyPair.v8Value());
     }
     clearResolver();
 }
 
 bool CryptoResultImpl::cancelled() const
 {
     return acquireLoad(&m_cancelled);
 }
@@ skipping 15 matching lines @@
         m_resolver = Resolver::create(scriptState, this).get();
     }
 }
 
 ScriptPromise CryptoResultImpl::promise()
 {
     return m_resolver ? m_resolver->promise() : ScriptPromise();
 }
 
 } // namespace blink