Add missing QUICHE_EXPORT_PRIVATE at a few places.

I'm getting ready to improve the regexp for the presubmit, and these instances
were flagged by the new expression.

PiperOrigin-RevId: 446793847

quiche/common/balsa/balsa_headers.h

diff --git a/quiche/common/balsa/balsa_headers.h b/quiche/common/balsa/balsa_headers.h
index d9931e7..3ce1180 100644
--- a/quiche/common/balsa/balsa_headers.h
+++ b/quiche/common/balsa/balsa_headers.h
@@ -1134,7 +1134,7 @@
 };
 
 // Succinctly describes one header line as indices into a buffer.
-struct BalsaHeaders::HeaderLineDescription {
+struct QUICHE_EXPORT_PRIVATE BalsaHeaders::HeaderLineDescription {
   HeaderLineDescription(size_t first_character_index, size_t key_end_index,
                         size_t value_begin_index, size_t last_character_index,
                         size_t buffer_base_index)
@@ -1172,7 +1172,7 @@
 
 // Base class for iterating the headers in a BalsaHeaders object, returning a
 // pair of string_view's for each header.
-class BalsaHeaders::iterator_base
+class QUICHE_EXPORT_PRIVATE BalsaHeaders::iterator_base
     : public std::iterator<std::forward_iterator_tag,
                            std::pair<absl::string_view, absl::string_view>> {
  public:
@@ -1268,7 +1268,7 @@
 };
 
 // A const iterator for all the header lines.
-class BalsaHeaders::const_header_lines_iterator
+class QUICHE_EXPORT_PRIVATE BalsaHeaders::const_header_lines_iterator
     : public BalsaHeaders::iterator_base {
  public:
   const_header_lines_iterator() : iterator_base() {}
@@ -1287,7 +1287,7 @@
 };
 
 // A const iterator that stops only on header lines for a particular key.
-class BalsaHeaders::const_header_lines_key_iterator
+class QUICHE_EXPORT_PRIVATE BalsaHeaders::const_header_lines_key_iterator
     : public BalsaHeaders::iterator_base {
  public:
   const_header_lines_key_iterator& operator++() {

quiche/http2/decoder/payload_decoders/payload_decoder_base_test_util.h

diff --git a/quiche/http2/decoder/payload_decoders/payload_decoder_base_test_util.h b/quiche/http2/decoder/payload_decoders/payload_decoder_base_test_util.h
index 77f53cc..b76f1a0 100644
--- a/quiche/http2/decoder/payload_decoders/payload_decoder_base_test_util.h
+++ b/quiche/http2/decoder/payload_decoders/payload_decoder_base_test_util.h
@@ -319,7 +319,7 @@
 // means unpadded as there is then no room for the Pad Length field).
 // The frame type must support padding.
 template <class Decoder, class DecoderPeer, class Listener>
-class AbstractPaddablePayloadDecoderTest
+class QUICHE_NO_EXPORT AbstractPaddablePayloadDecoderTest
     : public AbstractPayloadDecoderTest<Decoder, DecoderPeer, Listener>,
       public ::testing::WithParamInterface<int> {
   typedef AbstractPayloadDecoderTest<Decoder, DecoderPeer, Listener> Base;