Fixup use of gunit and gmock in QUIC

This CL makes it so QUIC code only relies on gunit and gmock inside impl. This was found to be causing build issues when compiling with --config=no_modules.

gfe-relnote: n/a, build-only changes
PiperOrigin-RevId: 245494431
Change-Id: I82ff873a08631212a9d74ce4df707b3aeaba2386
diff --git a/quic/test_tools/simple_session_notifier.h b/quic/test_tools/simple_session_notifier.h
index 17616b7..e7d4fdc 100644
--- a/quic/test_tools/simple_session_notifier.h
+++ b/quic/test_tools/simple_session_notifier.h
@@ -5,9 +5,9 @@
 #ifndef QUICHE_QUIC_TEST_TOOLS_SIMPLE_SESSION_NOTIFIER_H_
 #define QUICHE_QUIC_TEST_TOOLS_SIMPLE_SESSION_NOTIFIER_H_
 
-#include "testing/gmock/include/gmock/gmock.h"
 #include "net/third_party/quiche/src/quic/core/quic_interval_set.h"
 #include "net/third_party/quiche/src/quic/core/session_notifier_interface.h"
+#include "net/third_party/quiche/src/quic/platform/api/quic_test.h"
 
 namespace quic {