Change flags type in Http2FrameHeaderTypeAndFlagTest.

External contribution by tmoniuszko-opera at
https://github.com/google/quiche/pull/14.

Listing tests with --gtest_list_tests prints non-UTF-8 characters.
This change is to fix that.  See pull request for more details and
for why this matters.

PiperOrigin-RevId: 446459944

quiche/http2/http2_structures_test.cc

diff --git a/quiche/http2/http2_structures_test.cc b/quiche/http2/http2_structures_test.cc
index 7293f2f..c939f81 100644
--- a/quiche/http2/http2_structures_test.cc
+++ b/quiche/http2/http2_structures_test.cc
@@ -149,11 +149,11 @@
 
 #if GTEST_HAS_DEATH_TEST && !defined(NDEBUG)
 
-using TestParams = std::tuple<Http2FrameType, Http2FrameFlag>;
+using TestParams = std::tuple<Http2FrameType, uint8_t>;
 
 std::string TestParamToString(const testing::TestParamInfo<TestParams>& info) {
   Http2FrameType type = std::get<0>(info.param);
-  Http2FrameFlag flags = std::get<1>(info.param);
+  uint8_t flags = std::get<1>(info.param);
 
   return absl::StrCat(Http2FrameTypeToString(type), static_cast<int>(flags));
 }
@@ -170,7 +170,7 @@
   }
 
   const Http2FrameType type_;
-  const Http2FrameFlag flags_;
+  const uint8_t flags_;
 };
 
 class IsEndStreamTest : public Http2FrameHeaderTypeAndFlagTest {};