Improve memory estimate of SpdySessionPool in net/ MemoryDumpProvider.

net/spdy/hpack/hpack_static_table.h

Index: net/spdy/hpack/hpack_static_table.h
diff --git a/net/spdy/hpack/hpack_static_table.h b/net/spdy/hpack/hpack_static_table.h
index 923913487a739c713eac7ec91cf3f3481f4849b5..328ad2932f3e9e93dea12515b3176584b76c5288 100644
--- a/net/spdy/hpack/hpack_static_table.h
+++ b/net/spdy/hpack/hpack_static_table.h
@@ -42,6 +42,9 @@ class NET_EXPORT_PRIVATE HpackStaticTable {
     return static_name_index_;
   }
 
+  // Returns the estimate of dynamically allocated memory in bytes.
+  size_t EstimateMemoryUsage() const;
+
  private:
   HpackHeaderTable::EntryTable static_entries_;
   HpackHeaderTable::UnorderedEntrySet static_index_;