Fix some includes in third_party/http2 tests.

Include quiche_test_helpers.h for VERIFY_*, quiche_test.h for EXPECT_*,
and wrap some includes in pragma that used to be included transitively on a
different path where they were wrapped in pragma.

PiperOrigin-RevId: 441528815
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 5fc9a9f..856c298 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
@@ -24,6 +24,7 @@
 #include "quiche/http2/tools/http2_frame_builder.h"
 #include "quiche/http2/tools/random_decoder_test.h"
 #include "quiche/common/platform/api/quiche_export.h"
+#include "quiche/common/platform/api/quiche_test_helpers.h"
 
 namespace http2 {
 namespace test {
diff --git a/quiche/http2/hpack/varint/hpack_varint_decoder_test.cc b/quiche/http2/hpack/varint/hpack_varint_decoder_test.cc
index a81e891..020ca0f 100644
--- a/quiche/http2/hpack/varint/hpack_varint_decoder_test.cc
+++ b/quiche/http2/hpack/varint/hpack_varint_decoder_test.cc
@@ -14,6 +14,7 @@
 #include "quiche/http2/platform/api/http2_logging.h"
 #include "quiche/http2/tools/random_decoder_test.h"
 #include "quiche/common/platform/api/quiche_test.h"
+#include "quiche/common/platform/api/quiche_test_helpers.h"
 
 using ::testing::AssertionSuccess;
 
diff --git a/quiche/http2/http2_structures_test_util.h b/quiche/http2/http2_structures_test_util.h
index fb9aa5e..c628bf8 100644
--- a/quiche/http2/http2_structures_test_util.h
+++ b/quiche/http2/http2_structures_test_util.h
@@ -10,7 +10,7 @@
 #include "quiche/http2/http2_structures.h"
 #include "quiche/http2/test_tools/http2_random.h"
 #include "quiche/http2/tools/http2_frame_builder.h"
-#include "quiche/common/platform/api/quiche_test_helpers.h"
+#include "quiche/common/platform/api/quiche_test.h"
 
 namespace http2 {
 namespace test {