Add a size estimation mechanism to StoragePartitionHttpCacheDataRemover.

net/http/mock_http_cache.h

Index: net/http/mock_http_cache.h
diff --git a/net/http/mock_http_cache.h b/net/http/mock_http_cache.h
index 632bb3e63c16996290e5ed945c6d7f7909eea5c0..2c1aa57811cb47307f221cc1c9c57e8eb0c26565 100644
--- a/net/http/mock_http_cache.h
+++ b/net/http/mock_http_cache.h
@@ -34,6 +34,7 @@ class MockDiskEntry : public disk_cache::Entry,
   base::Time GetLastUsed() const override;
   base::Time GetLastModified() const override;
   int32 GetDataSize(int index) const override;
+  int GetEntrySize() const override;
   int ReadData(int index,
                int offset,
                IOBuffer* buf,
@@ -127,6 +128,10 @@ class MockDiskCache : public disk_cache::Backend {
                          const CompletionCallback& callback) override;
   int DoomEntriesSince(base::Time initial_time,
                        const CompletionCallback& callback) override;
+  int CalculateSizeOfEntriesBetween(
+      base::Time initial_time,
+      base::Time end_time,
+      const CompletionCallback& callback) override;
   scoped_ptr<Iterator> CreateIterator() override;
   void GetStats(base::StringPairs* stats) override;
   void OnExternalCacheHit(const std::string& key) override;