WebKit MediaStream cleanup: ASSERT-->DCHECK and ASSERT_NOT_REACHED-->NOTREACHED etc

third_party/WebKit/Source/modules/mediastream/NavigatorMediaStream.cpp

 /*
  *  Copyright (C) 2000 Harri Porten (porten@kde.org)
  *  Copyright (c) 2000 Daniel Molkentin (molkentin@kde.org)
  *  Copyright (c) 2000 Stefan Schimanski (schimmi@kde.org)
  *  Copyright (C) 2003, 2004, 2005, 2006 Apple Computer, Inc.
  *  Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Lesser General Public
  *  License as published by the Free Software Foundation; either
@@ skipping 36 matching lines @@
 
     UserMediaController* userMedia = UserMediaController::from(navigator.frame());
     if (!userMedia) {
         exceptionState.throwDOMException(NotSupportedError, "No user media controller available; is this a detached window?");
         return;
     }
 
     MediaErrorState errorState;
     UserMediaRequest* request = UserMediaRequest::create(navigator.frame()->document(), userMedia, options, successCallback, errorCallback, errorState);
     if (!request) {
-        ASSERT(errorState.hadException());
+        DCHECK(errorState.hadException());
         if (errorState.canGenerateException()) {
             errorState.raiseException(exceptionState);
         } else {
             errorCallback->handleEvent(errorState.createError());
         }
         return;
     }
 
     String errorMessage;
     if (!request->isSecureContextUse(errorMessage)) {
         request->failPermissionDenied(errorMessage);
         return;
     }
 
     request->start();
 }
 
 } // namespace blink