Use llvm::sys::fs::createTemporaryFile.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@185717 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/unittests/Tooling/RefactoringTest.cpp b/unittests/Tooling/RefactoringTest.cpp
index f4c086c..f8d10d286 100644
--- a/unittests/Tooling/RefactoringTest.cpp
+++ b/unittests/Tooling/RefactoringTest.cpp
@@ -194,7 +194,7 @@
     SmallString<1024> Path;
     int FD;
     llvm::error_code EC =
-        llvm::sys::fs::unique_file(Twine(Name) + "%%%%%%", FD, Path);
+        llvm::sys::fs::createTemporaryFile(Name, "", FD, Path);
     assert(!EC);
     (void)EC;