[WIP] bindings: Introduce PropertyBag

Source/modules/mediastream/MediaConstraintsImpl.cpp

 /*
  * Copyright (C) 2012 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:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 62 matching lines @@
             return false;
 
         HashMap<String, String>::const_iterator iter = mandatoryConstraintsHashMap.begin();
         for (; iter != mandatoryConstraintsHashMap.end(); ++iter)
             mandatoryConstraintsVector.append(WebMediaConstraint(iter->key, iter->value));
     }
 
     Vector<WebMediaConstraint> optionalConstraintsVector;
     if (names.contains(optionalName)) {
         ArrayValue optionalConstraints;
-        bool ok = DictionaryHelper::get(constraintsDictionary, optionalName, optionalConstraints);
+        bool ok = constraintsDictionary.get(optionalName, optionalConstraints);
         if (!ok || optionalConstraints.isUndefinedOrNull())
             return false;
 
         size_t numberOfConstraints;
         ok = optionalConstraints.length(numberOfConstraints);
         if (!ok)
             return false;
 
         for (size_t i = 0; i < numberOfConstraints; ++i) {
             Dictionary constraint;
             ok = optionalConstraints.get(i, constraint);
             if (!ok || constraint.isUndefinedOrNull())
                 return false;
             Vector<String> localNames;
             constraint.getOwnPropertyNames(localNames);
             if (localNames.size() != 1)
                 return false;
             String key = localNames[0];
             String value;
-            ok = DictionaryHelper::get(constraint, key, value);
+            ok = constraint.get(key, value);
             if (!ok)
                 return false;
             optionalConstraintsVector.append(WebMediaConstraint(key, value));
         }
     }
 
     optional.assign(optionalConstraintsVector);
     mandatory.assign(mandatoryConstraintsVector);
     return true;
 }
@@ skipping 15 matching lines @@
 
 WebMediaConstraints create()
 {
     WebMediaConstraints constraints;
     constraints.initialize();
     return constraints;
 }
 
 } // namespace MediaConstraintsImpl
 } // namespace blink