Make brokenImage() a static member of ImageResource class

Source/core/rendering/RenderImage.cpp

Index: Source/core/rendering/RenderImage.cpp
diff --git a/Source/core/rendering/RenderImage.cpp b/Source/core/rendering/RenderImage.cpp
index f9be3be4de05e9439b1456b4088a8d1e4f8ea36e..5288345a413d0598d7c5f39e74e4157b9d05d58b 100644
--- a/Source/core/rendering/RenderImage.cpp
+++ b/Source/core/rendering/RenderImage.cpp
@@ -99,7 +99,7 @@ IntSize RenderImage::imageSizeForError(ImageResource* newImage) const
     IntSize imageSize;
     if (newImage->willPaintBrokenImage()) {
         float deviceScaleFactor = WebCore::deviceScaleFactor(frame());
-        pair<Image*, float> brokenImageAndImageScaleFactor = newImage->brokenImage(deviceScaleFactor);
+        pair<Image*, float> brokenImageAndImageScaleFactor = ImageResource::brokenImage(deviceScaleFactor);
         imageSize = brokenImageAndImageScaleFactor.first->size();
         imageSize.scale(1 / brokenImageAndImageScaleFactor.second);
     } else
@@ -316,7 +316,7 @@ void RenderImage::paintReplaced(PaintInfo& paintInfo, const LayoutPoint& paintOf
             if (m_imageResource->errorOccurred() && !image->isNull() && usableWidth >= image->width() && usableHeight >= image->height()) {
                 float deviceScaleFactor = WebCore::deviceScaleFactor(frame());
                 // Call brokenImage() explicitly to ensure we get the broken image icon at the appropriate resolution.
-                pair<Image*, float> brokenImageAndImageScaleFactor = m_imageResource->cachedImage()->brokenImage(deviceScaleFactor);
+                pair<Image*, float> brokenImageAndImageScaleFactor = ImageResource::brokenImage(deviceScaleFactor);
                 image = brokenImageAndImageScaleFactor.first;
                 IntSize imageSize = image->size();
                 imageSize.scale(1 / brokenImageAndImageScaleFactor.second);