remove headers from test

Author: huixie90

libcxx/test/std/containers/container.adaptors/flat.map/flat.map.modifiers/swap_exception.pass.cpp

@@ -25,7 +25,6 @@
 
 #include "test_macros.h"
 #include "../helpers.h"
-#include "check_assertion.h"
 
 template <class F>
 void test_swap_exception_guarantee([[maybe_unused]] F&& swap_function) {

libcxx/test/std/containers/container.adaptors/flat.multimap/flat.multimap.modifiers/swap_exception.pass.cpp

@@ -27,7 +27,6 @@
 
 #include "test_macros.h"
 #include "../helpers.h"
-#include "check_assertion.h"
 
 template <class F>
 void test_swap_exception_guarantee([[maybe_unused]] F&& swap_function) {

libcxx/test/std/containers/container.adaptors/flat.multiset/flat.multiset.modifiers/swap_exception.pass.cpp

@@ -25,7 +25,6 @@
 
 #include "test_macros.h"
 #include "../helpers.h"
-#include "check_assertion.h"
 
 template <class F>
 void test_swap_exception_guarantee([[maybe_unused]] F&& swap_function) {

libcxx/test/std/containers/container.adaptors/flat.set/flat.set.modifiers/swap_exception.pass.cpp

@@ -25,7 +25,6 @@
 
 #include "test_macros.h"
 #include "../helpers.h"
-#include "check_assertion.h"
 
 template <class F>
 void test_swap_exception_guarantee([[maybe_unused]] F&& swap_function) {