Remove unmatched clang diagnostic pop #pragma

PiperOrigin-RevId: 334930863
Change-Id: Ic81bb831f57b070a972cf0483cbabe6da43fb4e4

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 53d2d15..107b49b 100644
--- a/http2/platform/api/http2_test_helpers.h
+++ b/http2/platform/api/http2_test_helpers.h
@@ -7,8 +7,6 @@
 
 #include "net/third_party/quiche/src/common/platform/api/quiche_test.h"
 
-#pragma clang diagnostic pop
-
 #define VERIFY_AND_RETURN_SUCCESS(expression) \
   {                                           \
     VERIFY_SUCCESS(expression);               \