Merge http2/platform/impl/http2_test_helpers_impl.h into quiche/common/platform/impl/quiche_test_helpers_impl.h.

To roll into Chromium, the contents of
net/http2/platform/impl/http2_test_helpers_impl.h and
net/http2/platform/impl/http2_test_helpers_impl.cc need to be copied to
net/quiche/common/platform/impl/quiche_test_helpers_impl.h and a newly added
net/quiche/common/platform/impl/quiche_test_helpers_impl.cc.  After that,
net/http2/platform/impl/ can be deleted.

This platform file does not seem to be used in Envoy.

PiperOrigin-RevId: 433264032

http2/platform/api/http2_test_helpers.h

diff --git a/http2/platform/api/http2_test_helpers.h b/http2/platform/api/http2_test_helpers.h
index ccd3e72..eab4fef 100644
--- a/http2/platform/api/http2_test_helpers.h
+++ b/http2/platform/api/http2_test_helpers.h
@@ -3,9 +3,8 @@
 
 // Provides VERIFY_* macros, similar to EXPECT_* and ASSERT_*, but they return
 // an AssertionResult if the condition is not satisfied.
-#include "net/http2/platform/impl/http2_test_helpers_impl.h"
-
 #include "common/platform/api/quiche_test.h"
+#include "net/quiche/common/platform/impl/quiche_test_helpers_impl.h"
 
 #define VERIFY_AND_RETURN_SUCCESS(expression) \
   {                                           \