Make Resource::resourceBuffer() to return PassRefPtr<const SharedBuffer>

third_party/WebKit/Source/core/fetch/ImageResource.cpp

 /*
     Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
     Copyright (C) 2001 Dirk Mueller (mueller@kde.org)
     Copyright (C) 2002 Waldo Bastian (bastian@kde.org)
     Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
     Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
     License as published by the Free Software Foundation; either
@@ skipping 213 matching lines @@
         if (!ThreadHeap::willObjectBeLazilySwept(this))
             Platform::current()->currentThread()->getWebTaskRunner()->postTask(BLINK_FROM_HERE, WTF::bind(&ImageResource::doResetAnimation, wrapWeakPersistent(this)));
         else
             m_image->resetAnimation();
     }
     if (m_multipartParser)
         m_multipartParser->cancel();
     Resource::allClientsAndObserversRemoved();
 }
 
-PassRefPtr<SharedBuffer> ImageResource::resourceBuffer() const
+PassRefPtr<const SharedBuffer> ImageResource::resourceBuffer() const
 {
     if (data())
         return data();
     if (m_image)
         return m_image->data();
     return nullptr;
 }
 
 void ImageResource::appendData(const char* data, size_t length)
 {
@@ skipping 340 matching lines @@
     if (response().wasFetchedViaServiceWorker())
         return response().serviceWorkerResponseType() != WebServiceWorkerResponseTypeOpaque;
     if (!getImage()->currentFrameHasSingleSecurityOrigin())
         return false;
     if (passesAccessControlCheck(securityOrigin))
         return true;
     return !securityOrigin->taintsCanvas(response().url());
 }
 
 } // namespace blink