Removing Unused function from ImageDecodingStore class

Source/platform/graphics/ImageDecodingStore.cpp

Index: Source/platform/graphics/ImageDecodingStore.cpp
diff --git a/Source/platform/graphics/ImageDecodingStore.cpp b/Source/platform/graphics/ImageDecodingStore.cpp
index 1d7e1c942cf4a2968aa5570dcf69c6f611d2caa7..f65428b4e552cf625aa4b3ce2bacb7b2acb0130d 100644
--- a/Source/platform/graphics/ImageDecodingStore.cpp
+++ b/Source/platform/graphics/ImageDecodingStore.cpp
@@ -178,12 +178,6 @@ int ImageDecodingStore::cacheEntries()
     return m_decoderCacheMap.size();
 }
 
-int ImageDecodingStore::decoderCacheEntries()
-{
-    MutexLocker lock(m_mutex);
-    return m_decoderCacheMap.size();
-}
-
 void ImageDecodingStore::prune()
 {
     TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("blink.image_decoding"), "ImageDecodingStore::prune");