[Cronet] Integrate CrNet functionality into Cronet on iOS.

components/cronet/ios/test/quic_test_server.cc

Index: components/cronet/ios/test/quic_test_server.cc
diff --git a/components/cronet/ios/test/quic_test_server.cc b/components/cronet/ios/test/quic_test_server.cc
index 67b887e4ebc3a174fdcaff6b269cedd43553ad21..a6ed33f537bbe917a35b08b0ca7a167180f29a71 100644
--- a/components/cronet/ios/test/quic_test_server.cc
+++ b/components/cronet/ios/test/quic_test_server.cc
@@ -50,10 +50,10 @@ void SetupQuicInMemoryCache() {
     return;
   setup_done = true;
   net::SpdyHeaderBlock headers;
-  headers.ReplaceOrAppendHeader(kHelloHeaderName, kHelloHeaderValue);
-  headers.ReplaceOrAppendHeader(kStatusHeader, kHelloStatus);
+  headers.AppendValueOrAddHeader(kHelloHeaderName, kHelloHeaderValue);
+  headers.AppendValueOrAddHeader(kStatusHeader, kHelloStatus);
   net::SpdyHeaderBlock trailers;
-  trailers.ReplaceOrAppendHeader(kHelloTrailerName, kHelloTrailerValue);
+  trailers.AppendValueOrAddHeader(kHelloTrailerName, kHelloTrailerValue);
   net::QuicInMemoryCache::GetInstance()->AddResponse(
       kTestServerHost, kHelloPath, std::move(headers), kHelloBodyValue,
       std::move(trailers));