Remove no-longer-required QUIC_EXPORTs

Now that these files have been moved from quic/core to quic/test_tools we can remove the annotation.

gfe-relnote: n/a, comment-only change
PiperOrigin-RevId: 277088490
Change-Id: Ic46c8926f59ec167405c9dbc97a94bcbc798646f

quic/test_tools/qpack/qpack_offline_decoder.h

diff --git a/quic/test_tools/qpack/qpack_offline_decoder.h b/quic/test_tools/qpack/qpack_offline_decoder.h
index e292385..e945737 100644
--- a/quic/test_tools/qpack/qpack_offline_decoder.h
+++ b/quic/test_tools/qpack/qpack_offline_decoder.h
@@ -19,8 +19,7 @@
 // a list of expected header lists read from another file.  File format is
 // described at
 // https://github.com/quicwg/base-drafts/wiki/QPACK-Offline-Interop.
-class /*QUIC_EXPORT_PRIVATE*/ QpackOfflineDecoder
-    : public QpackDecoder::EncoderStreamErrorDelegate {
+class QpackOfflineDecoder : public QpackDecoder::EncoderStreamErrorDelegate {
  public:
   QpackOfflineDecoder();
   ~QpackOfflineDecoder() override = default;
@@ -40,7 +39,7 @@
   // Data structure to hold TestHeadersHandler and QpackProgressiveDecoder until
   // decoding of a header header block (and all preceding header blocks) is
   // complete.
-  struct /*QUIC_EXPORT_PRIVATE*/ Decoder {
+  struct Decoder {
     std::unique_ptr<test::TestHeadersHandler> headers_handler;
     std::unique_ptr<QpackProgressiveDecoder> progressive_decoder;
     uint64_t stream_id;

quic/test_tools/qpack/qpack_test_utils.h

diff --git a/quic/test_tools/qpack/qpack_test_utils.h b/quic/test_tools/qpack/qpack_test_utils.h
index d112e0d..2dc3933 100644
--- a/quic/test_tools/qpack/qpack_test_utils.h
+++ b/quic/test_tools/qpack/qpack_test_utils.h
@@ -27,8 +27,7 @@
     FragmentMode fragment_mode);
 
 // Mock QpackUnidirectionalStreamSenderDelegate implementation.
-class /*QUIC_EXPORT_PRIVATE*/ MockQpackStreamSenderDelegate
-    : public QpackStreamSenderDelegate {
+class MockQpackStreamSenderDelegate : public QpackStreamSenderDelegate {
  public:
   ~MockQpackStreamSenderDelegate() override = default;