Refactor cache counting into a separate helper class

content/browser/blob_storage/blob_reader_unittest.cc

Index: content/browser/blob_storage/blob_reader_unittest.cc
diff --git a/content/browser/blob_storage/blob_reader_unittest.cc b/content/browser/blob_storage/blob_reader_unittest.cc
index 399af8f4731de47bac1954b246d91678250d5e4d..ad1194bc1f51bf135f9b5f43ce3a77609f7353af 100644
--- a/content/browser/blob_storage/blob_reader_unittest.cc
+++ b/content/browser/blob_storage/blob_reader_unittest.cc
@@ -103,6 +103,8 @@ class DelayedReadEntry : public disk_cache::Entry {
     return entry_->GetDataSize(index);
   }
 
+  int64_t GetEntrySize() const override { return entry_->GetEntrySize(); }
+
   int ReadData(int index,
                int offset,
                IOBuffer* buf,