[WIP] bindings: Introduce PropertyBag

Source/bindings/core/v8/custom/V8BlobCustomHelpers.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 54 matching lines @@
 void ParsedProperties::setDefaultLastModified()
 {
     setLastModified(currentTime());
 }
 
 bool ParsedProperties::parseBlobPropertyBag(v8::Local<v8::Value> propertyBag, const char* blobClassName, ExceptionState& exceptionState, v8::Isolate* isolate)
 {
     TONATIVE_DEFAULT(Dictionary, dictionary, Dictionary(propertyBag, isolate), false);
 
     String endings;
-    TONATIVE_DEFAULT(bool, containsEndings, DictionaryHelper::get(dictionary, "endings", endings), false);
+    TONATIVE_DEFAULT(bool, containsEndings, dictionary.get("endings", endings), false);
     if (containsEndings) {
         if (endings != "transparent" && endings != "native") {
             exceptionState.throwTypeError("The 'endings' property must be either 'transparent' or 'native'.");
             return false;
         }
         if (endings == "native")
             m_normalizeLineEndingsToNative = true;
     }
 
-    TONATIVE_DEFAULT(bool, containsType, DictionaryHelper::get(dictionary, "type", m_contentType), false);
+    TONATIVE_DEFAULT(bool, containsType, dictionary.get("type", m_contentType), false);
     if (containsType) {
         if (!m_contentType.containsOnlyASCII()) {
             exceptionState.throwDOMException(SyntaxError, "The 'type' property must consist of ASCII characters.");
             return false;
         }
         m_contentType = m_contentType.lower();
     }
 
     if (!m_hasFileProperties)
         return true;
 
     v8::Local<v8::Value> lastModified;
-    TONATIVE_DEFAULT(bool, containsLastModified, DictionaryHelper::get(dictionary, "lastModified", lastModified), false);
+    TONATIVE_DEFAULT(bool, containsLastModified, dictionary.get("lastModified", lastModified), false);
     if (containsLastModified) {
         TONATIVE_DEFAULT(long long, lastModifiedInt, toInt64(lastModified), false);
         setLastModified(static_cast<double>(lastModifiedInt) / msPerSecond);
     } else {
         setDefaultLastModified();
     }
 
     return true;
 }
 
@@ skipping 23 matching lines @@
             TOSTRING_DEFAULT(V8StringResource<>, stringValue, item, false);
             blobData.appendText(stringValue, normalizeLineEndingsToNative);
         }
     }
     return true;
 }
 
 } // namespace V8BlobCustomHelpers
 
 } // namespace blink