Include PathV1.h in a file that uses it.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@183786 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/unittests/Tooling/RefactoringTest.cpp b/unittests/Tooling/RefactoringTest.cpp
index cea6c41..da75925 100644
--- a/unittests/Tooling/RefactoringTest.cpp
+++ b/unittests/Tooling/RefactoringTest.cpp
@@ -26,6 +26,7 @@
 #include "clang/Tooling/Tooling.h"
 #include "llvm/ADT/SmallString.h"
 #include "llvm/Support/Path.h"
+#include "llvm/Support/PathV1.h"
 #include "gtest/gtest.h"
 
 namespace clang {