Revert "[GWP-ASan] Fix 6413872"

This reverts commit df87e62cbd4b5090b5349247d29457706d2ac4e8.

Parent change https://reviews.llvm.org/D140173 broke an internal build.
I'll integrate this patch into the re-land for
https://reviews.llvm.org/D140173.

GitOrigin-RevId: 4c0b3964cbc0f8366903e5fb5784af01b79545a1
diff --git a/tests/harness.h b/tests/harness.h
index efac826..e6be68c 100644
--- a/tests/harness.h
+++ b/tests/harness.h
@@ -18,7 +18,7 @@
 #else
 #include "gtest/gtest.h"
 using Test = ::testing::Test;
-template <typename T> using TestWithParam = ::testing::TestWithParam<T>;
+template <typename T> using TestWithParam = ::zxtest::TestWithParam<T>;
 #endif
 
 #include "gwp_asan/guarded_pool_allocator.h"