Deprecate FLAGS_quic_reloadable_flag_enable_async_get_proof

net/quic/test_tools/crypto_test_utils.cc

Index: net/quic/test_tools/crypto_test_utils.cc
diff --git a/net/quic/test_tools/crypto_test_utils.cc b/net/quic/test_tools/crypto_test_utils.cc
index 5b22e1ed9ebaf9a266b880e0099f8df6a96955a9..92c563187c1fa6b10b22320151085da7e951b430 100644
--- a/net/quic/test_tools/crypto_test_utils.cc
+++ b/net/quic/test_tools/crypto_test_utils.cc
@@ -564,10 +564,32 @@ uint64_t LeafCertHashForTesting() {
   QuicSocketAddress server_address;
   QuicCryptoProof proof;
   std::unique_ptr<ProofSource> proof_source(ProofSourceForTesting());
-  if (!proof_source->GetProof(server_address, "", "",
-                              AllSupportedVersions().front(), "",
-                              QuicTagVector(), &chain, &proof) ||
-      chain->certs.empty()) {
+
+  class Callback : public ProofSource::Callback {
+   public:
+    Callback(bool* ok, QuicReferenceCountedPointer<ProofSource::Chain>* chain)
+        : ok_(ok), chain_(chain) {}
+
+    void Run(bool ok,
+             const QuicReferenceCountedPointer<ProofSource::Chain>& chain,
+             const QuicCryptoProof& /* proof */,
+             std::unique_ptr<ProofSource::Details> /* details */) override {
+      *ok_ = ok;
+      *chain_ = chain;
+    }
+
+   private:
+    bool* ok_;
+    QuicReferenceCountedPointer<ProofSource::Chain>* chain_;
+  };
+
+  // Note: relies on the callback being invoked synchronously
+  bool ok = false;
+  proof_source->GetProof(
+      server_address, "", "", AllSupportedVersions().front(), "",
+      QuicTagVector(),
+      std::unique_ptr<ProofSource::Callback>(new Callback(&ok, &chain)));
+  if (!ok || chain->certs.empty()) {
     DCHECK(false) << "Proof generation failed";
     return 0;
   }