Remove unused blink::WebStorageArea::memoryBytesUsedByCache().

content/renderer/dom_storage/webstoragearea_impl.cc

Index: content/renderer/dom_storage/webstoragearea_impl.cc
diff --git a/content/renderer/dom_storage/webstoragearea_impl.cc b/content/renderer/dom_storage/webstoragearea_impl.cc
index dd20bece433c0423ac7dd704be75222caebbf693..1c12a80549ad52c7c4e0aa4a2028df0a80bbb15e 100644
--- a/content/renderer/dom_storage/webstoragearea_impl.cc
+++ b/content/renderer/dom_storage/webstoragearea_impl.cc
@@ -76,8 +76,4 @@ void WebStorageAreaImpl::clear(const WebURL& page_url) {
   cached_area_->Clear(connection_id_, page_url);
 }
 
-size_t WebStorageAreaImpl::memoryBytesUsedByCache() const {
-  return cached_area_->MemoryBytesUsedByCache();
-}
-
 }  // namespace content