Make ImageDecoder::setSize non-virtual

Source/core/platform/image-decoders/ImageDecoder.h

Index: Source/core/platform/image-decoders/ImageDecoder.h
diff --git a/Source/core/platform/image-decoders/ImageDecoder.h b/Source/core/platform/image-decoders/ImageDecoder.h
index 724e27c918dc3e3c7a5dcd00f2ef98bfa3cd2aeb..338c7f7707df3968f0290545c9b46191afbe4b2c 100644
--- a/Source/core/platform/image-decoders/ImageDecoder.h
+++ b/Source/core/platform/image-decoders/ImageDecoder.h
@@ -255,7 +255,7 @@ namespace WebCore {
 
         // Returns whether the size is legal (i.e. not going to result in
         // overflow elsewhere).  If not, marks decoding as failed.
-        virtual bool setSize(unsigned width, unsigned height)
+        bool setSize(unsigned width, unsigned height)
         {
             if (isOverSize(width, height))
                 return setFailed();