Move data URI image resources to be async loaded.

Source/core/loader/ImageLoader.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2009, 2010 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
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 437 matching lines @@
 
 bool ImageLoader::shouldLoadImmediately(const KURL& url) const
 {
     // We force any image loads which might require alt content through the asynchronous path so that we can add the shadow DOM
     // for the alt-text content when style recalc is over and DOM mutation is allowed again.
     if (!url.isNull()) {
         Resource* resource = memoryCache()->resourceForURL(url, m_element->document().fetcher()->getCacheIdentifier());
         if (resource && !resource->errorOccurred())
             return true;
     }
-    return (m_loadingImageDocument || isHTMLObjectElement(m_element) || isHTMLEmbedElement(m_element) || url.protocolIsData());
+    return (m_loadingImageDocument || isHTMLObjectElement(m_element) || isHTMLEmbedElement(m_element));
 }
 
 void ImageLoader::notifyFinished(Resource* resource)
 {
     WTF_LOG(Timers, "ImageLoader::notifyFinished %p; m_hasPendingLoadEvent=%d",
         this, m_hasPendingLoadEvent);
 
     ASSERT(m_failedLoadURL.isEmpty());
     ASSERT(resource == m_image.get());
 
@@ skipping 195 matching lines @@
 
 void ImageLoader::sourceImageChanged()
 {
     for (auto& client : m_clients) {
         ImageLoaderClient* handle = client;
         handle->notifyImageSourceChanged();
     }
 }
 
 } // namespace blink