Oilpan: Build fix after r167288

Source/core/inspector/InspectorDOMStorageAgent.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2013 Samsung Electronics. 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 183 matching lines @@
 PassOwnPtrWillBeRawPtr<StorageArea> InspectorDOMStorageAgent::findStorageArea(ErrorString* errorString, const RefPtr<JSONObject>& storageId, Frame*& targetFrame)
 {
     String securityOrigin;
     bool isLocalStorage = false;
     bool success = storageId->getString("securityOrigin", &securityOrigin);
     if (success)
         success = storageId->getBoolean("isLocalStorage", &isLocalStorage);
     if (!success) {
         if (errorString)
             *errorString = "Invalid storageId format";
-        return nullptr;
+        return 0;
     }
 
     Frame* frame = m_pageAgent->findFrameWithSecurityOrigin(securityOrigin);
     if (!frame) {
         if (errorString)
             *errorString = "Frame not found for the given security origin";
-        return nullptr;
+        return 0;
     }
     targetFrame = frame;
 
     if (isLocalStorage)
         return StorageNamespace::localStorageArea(frame->document()->securityOrigin());
     return m_pageAgent->page()->sessionStorage()->storageArea(frame->document()->securityOrigin());
 }
 
 } // namespace WebCore