Split Dictionary's get and convert into DictionaryHelper.

Source/modules/mediastream/UserMediaRequest.cpp

 /*
  * Copyright (C) 2011 Ericsson AB. All rights reserved.
  * 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.
@@ skipping 39 matching lines @@
 static blink::WebMediaConstraints parseOptions(const Dictionary& options, const String& mediaType, ExceptionState& exceptionState)
 {
     blink::WebMediaConstraints constraints;
 
     Dictionary constraintsDictionary;
     bool ok = options.get(mediaType, constraintsDictionary);
     if (ok && !constraintsDictionary.isUndefinedOrNull())
         constraints = MediaConstraintsImpl::create(constraintsDictionary, exceptionState);
     else {
         bool mediaRequested = false;
-        options.get(mediaType, mediaRequested);
+        DictionaryHelper::get(options, mediaType, mediaRequested);
         if (mediaRequested)
             constraints = MediaConstraintsImpl::create();
     }
 
     return constraints;
 }
 
 UserMediaRequest* UserMediaRequest::create(ExecutionContext* context, UserMediaController* controller, const Dictionary& options, PassOwnPtr<NavigatorUserMediaSuccessCallback> successCallback, PassOwnPtr<NavigatorUserMediaErrorCallback> errorCallback, ExceptionState& exceptionState)
 {
     blink::WebMediaConstraints audio = parseOptions(options, "audio", exceptionState);
@@ skipping 108 matching lines @@
 {
     if (m_controller) {
         m_controller->cancelUserMediaRequest(this);
         m_controller = 0;
     }
 
     ContextLifecycleObserver::contextDestroyed();
 }
 
 } // namespace WebCore