Migrates the old cc_fuzz_target in //third_party/spdy to the modern go/fuzztest framework.

PiperOrigin-RevId: 679146196

quiche/spdy/core/http2_frame_decoder_adapter_fuzzer.cc

diff --git a/quiche/spdy/core/http2_frame_decoder_adapter_fuzzer.cc b/quiche/spdy/core/http2_frame_decoder_adapter_fuzzer.cc
index 9073a75..b54ecfa 100644
--- a/quiche/spdy/core/http2_frame_decoder_adapter_fuzzer.cc
+++ b/quiche/spdy/core/http2_frame_decoder_adapter_fuzzer.cc
@@ -1,13 +1,11 @@
-#include <cstddef>
-#include <cstdint>
-
+#include "testing/fuzzing/fuzztest.h"
 #include "quiche/http2/core/http2_frame_decoder_adapter.h"
 #include "quiche/http2/core/spdy_no_op_visitor.h"
 
-extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+void DecoderFuzzTest(const std::string& data) {
   spdy::SpdyNoOpVisitor visitor;
   http2::Http2DecoderAdapter decoder;
   decoder.set_visitor(&visitor);
-  decoder.ProcessInput(reinterpret_cast<const char *>(data), size);
-  return 0;  // Always return 0; other values are reserved for future uses.
+  decoder.ProcessInput(data.data(), data.size());
 }
+FUZZ_TEST(Http2FrameDecoderAdapterFuzzTest, DecoderFuzzTest);