Use QuicheTest and quiche_test.h in third_party/http2.

The motivation is that these files have to be included with
#pragma clang diagnostic ignored "-Weverything", otherwise CLs touching test
files will not build.

PiperOrigin-RevId: 334632337
Change-Id: I74d8cdef4b07eed79880d1ca7e0476b3a2c5c184
diff --git a/http2/hpack/decoder/hpack_decoder_string_buffer_test.cc b/http2/hpack/decoder/hpack_decoder_string_buffer_test.cc
index 9f3e2d3..69da1da 100644
--- a/http2/hpack/decoder/hpack_decoder_string_buffer_test.cc
+++ b/http2/hpack/decoder/hpack_decoder_string_buffer_test.cc
@@ -11,6 +11,7 @@
 #include "net/third_party/quiche/src/http2/platform/api/http2_logging.h"
 #include "net/third_party/quiche/src/http2/platform/api/http2_string_utils.h"
 #include "net/third_party/quiche/src/http2/platform/api/http2_test_helpers.h"
+#include "net/third_party/quiche/src/common/platform/api/quiche_test.h"
 
 using ::testing::AssertionResult;
 using ::testing::AssertionSuccess;
@@ -20,7 +21,7 @@
 namespace test {
 namespace {
 
-class HpackDecoderStringBufferTest : public ::testing::Test {
+class HpackDecoderStringBufferTest : public QuicheTest {
  protected:
   typedef HpackDecoderStringBuffer::State State;
   typedef HpackDecoderStringBuffer::Backing Backing;