libcxx: Rename last two .hpp files in libcxx to .h

Differential Revision: https://reviews.llvm.org/D66544

llvm-svn: 369597
diff --git a/libcxx/test/std/utilities/function.objects/comparisons/greater.pass.cpp b/libcxx/test/std/utilities/function.objects/comparisons/greater.pass.cpp
index 35c0575..b1f1fe6 100644
--- a/libcxx/test/std/utilities/function.objects/comparisons/greater.pass.cpp
+++ b/libcxx/test/std/utilities/function.objects/comparisons/greater.pass.cpp
@@ -15,7 +15,7 @@
 #include <cassert>
 
 #include "test_macros.h"
-#include "pointer_comparison_test_helper.hpp"
+#include "pointer_comparison_test_helper.h"
 
 int main(int, char**)
 {