PskSerializationUtils: change deserialize to take in range

Summary:
Do not require the caller to pass in a `std::string` to deserialize. Take in
the buffer as a view type, which allows more flexibility for the caller.

Reviewed By: zalecodez

Differential Revision: D64780788

fbshipit-source-id: 7bd710c981b6dbb4dd7f4d495f8fc3c8bc570d9e

proxygen/lib/transport/PersistentFizzPskCache.h

@@ -50,7 +50,8 @@ class PersistentFizzPskCache : public fizz::client::PskCache {
     if (serialized) {
       try {
         auto deserialized = fizz::client::deserializePsk(
-            fizz::openssl::certificateSerializer(), serialized->serialized);
+            fizz::openssl::certificateSerializer(),
+            folly::ByteRange(serialized->serialized));
         serialized->uses++;
         if (maxPskUses_ != 0 && serialized->uses >= maxPskUses_) {
           cache_.remove(identity);

proxygen/lib/transport/PersistentQuicPskCache.cpp

@@ -45,8 +45,9 @@ folly::Optional<quic::QuicCachedPsk> PersistentQuicPskCache::getPsk(
   }
   try {
     quic::QuicCachedPsk quicCachedPsk;
-    quicCachedPsk.cachedPsk = fizz::client::deserializePsk(
-        fizz::openssl::certificateSerializer(), cachedPsk->fizzPsk);
+    quicCachedPsk.cachedPsk =
+        fizz::client::deserializePsk(fizz::openssl::certificateSerializer(),
+                                     folly::ByteRange(cachedPsk->fizzPsk));
 
     auto buf = folly::IOBuf::wrapBuffer(cachedPsk->quicParams.data(),
                                         cachedPsk->quicParams.length());