Split Dictionary's get and convert into DictionaryHelper.

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 122 matching lines @@
         ASSERT_NOT_REACHED();
         return ScriptPromise();
     }
 
     return promise;
 }
 
 static bool copyStringProperty(const char* property, const Dictionary& source, JSONObject* destination)
 {
     String value;
-    if (!source.get(property, value))
+    if (!DictionaryHelper::get(source, property, value))
         return false;
     destination->setString(property, value);
     return true;
 }
 
 static bool copySequenceOfStringProperty(const char* property, const Dictionary& source, JSONObject* destination)
 {
     Vector<String> value;
-    if (!source.get(property, value))
+    if (!DictionaryHelper::get(source, property, value))
         return false;
     RefPtr<JSONArray> jsonArray = JSONArray::create();
     for (unsigned i = 0; i < value.size(); ++i)
         jsonArray->pushString(value[i]);
     destination->setArray(property, jsonArray.release());
     return true;
 }
 
 // FIXME: At the time of writing this is not a part of the spec. It is based an
 // an unpublished editor's draft for:
 //   https://www.w3.org/Bugs/Public/show_bug.cgi?id=24963
 // See http://crbug.com/373917.
 static bool copyJwkDictionaryToJson(const Dictionary& dict, CString& jsonUtf8, CryptoResult* result)
 {
     RefPtr<JSONObject> jsonObject = JSONObject::create();
 
     if (!copyStringProperty("kty", dict, jsonObject.get())) {
         result->completeWithError(blink::WebCryptoErrorTypeData, "The required JWK property \"kty\" was missing");
         return false;
     }
 
     copyStringProperty("use", dict, jsonObject.get());
     copySequenceOfStringProperty("key_ops", dict, jsonObject.get());
     copyStringProperty("alg", dict, jsonObject.get());
 
     bool ext;
-    if (dict.get("ext", ext))
+    if (DictionaryHelper::get(dict, "ext", ext))
         jsonObject->setBoolean("ext", ext);
 
     const char* const propertyNames[] = { "d", "n", "e", "p", "q", "dp", "dq", "qi", "k" };
     for (unsigned i = 0; i < WTF_ARRAY_LENGTH(propertyNames); ++i)
         copyStringProperty(propertyNames[i], dict, jsonObject.get());
 
     String json = jsonObject->toJSONString();
     jsonUtf8 = json.utf8();
     return true;
 }
@@ skipping 201 matching lines @@
         return promise;
 
     if (!unwrappingKey->canBeUsedForAlgorithm(unwrapAlgorithm, blink::WebCryptoOperationUnwrapKey, result.get()))
         return promise;
 
     blink::Platform::current()->crypto()->unwrapKey(format, wrappedKey.bytes(), wrappedKey.byteLength(), unwrappingKey->key(), unwrapAlgorithm, unwrappedKeyAlgorithm, extractable, keyUsages, result->result());
     return promise;
 }
 
 } // namespace WebCore