Add more out of line copy ctors for complex classes.

net/quic/crypto/quic_compressed_certs_cache.h

Index: net/quic/crypto/quic_compressed_certs_cache.h
diff --git a/net/quic/crypto/quic_compressed_certs_cache.h b/net/quic/crypto/quic_compressed_certs_cache.h
index 5bb0cf48bbfe0c0e5834fceb0c6d79b3c9402fb6..1a731c8a4cd900ef90e1c6366519821b1c27edd9 100644
--- a/net/quic/crypto/quic_compressed_certs_cache.h
+++ b/net/quic/crypto/quic_compressed_certs_cache.h
@@ -74,6 +74,7 @@ class NET_EXPORT_PRIVATE QuicCompressedCertsCache {
     CachedCerts();
     CachedCerts(const UncompressedCerts& uncompressed_certs,
                 const string& compressed_cert);
+    CachedCerts(const CachedCerts& other);
 
     ~CachedCerts();