Avoid srcset upscaling for 1x DPR scenarios

Source/core/html/parser/HTMLSrcsetParser.cpp

 /*
  * Copyright (C) 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 320 matching lines @@
         float nextDensity;
         float currentDensity;
         float geometricMean;
 
         nextDensity = imageCandidates[next]->density();
         if (nextDensity < deviceScaleFactor)
             continue;
 
         currentDensity = imageCandidates[i]->density();
         geometricMean = sqrt(currentDensity * nextDensity);
-        if (deviceScaleFactor >= geometricMean)
+        if (((deviceScaleFactor <= 1.0) && (deviceScaleFactor > currentDensity)) || (deviceScaleFactor >= geometricMean))
             return next;
         break;
     }
     return i;
 }
 
 static unsigned avoidDownloadIfHigherDensityResourceIsInCache(Vector<ImageCandidate*>& imageCandidates, unsigned winner, Document* document)
 {
     if (!document)
         return winner;
@@ skipping 79 matching lines @@
     Vector<ImageCandidate> imageCandidates;
     imageCandidates.append(srcsetImageCandidate);
 
     if (!srcAttribute.isEmpty())
         imageCandidates.append(ImageCandidate(srcAttribute, 0, srcAttribute.length(), DescriptorParsingResult(), ImageCandidate::SrcOrigin));
 
     return pickBestImageCandidate(deviceScaleFactor, sourceSize, imageCandidates).toString();
 }
 
 }