Move data URI image resources to be async loaded.

Source/core/html/parser/HTMLSrcsetParser.cpp

Index: Source/core/html/parser/HTMLSrcsetParser.cpp
diff --git a/Source/core/html/parser/HTMLSrcsetParser.cpp b/Source/core/html/parser/HTMLSrcsetParser.cpp
index 8283ecd41536a733ce2d23e426c427da4eeffa4c..28cda2813e8a5e032a85153bfea27583cbd3bcd2 100644
--- a/Source/core/html/parser/HTMLSrcsetParser.cpp
+++ b/Source/core/html/parser/HTMLSrcsetParser.cpp
@@ -351,7 +351,7 @@ static unsigned avoidDownloadIfHigherDensityResourceIsInCache(Vector<ImageCandid
         return winner;
     for (unsigned i = imageCandidates.size() - 1; i > winner; --i) {
         KURL url = document->completeURL(stripLeadingAndTrailingHTMLSpaces(imageCandidates[i]->url()));
-        if (memoryCache()->resourceForURL(url, document->fetcher()->getCacheIdentifier()))
+        if (memoryCache()->resourceForURL(url, document->fetcher()->getCacheIdentifier()) || url.protocolIsData())
             return i;
     }
     return winner;