Support/FileSystem: Add remove implementation.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120817 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/unittests/Support/Path.cpp b/unittests/Support/Path.cpp
index d19bf4a..40e6281 100644
--- a/unittests/Support/Path.cpp
+++ b/unittests/Support/Path.cpp
@@ -128,7 +128,8 @@
   EXPECT_TRUE(TempFileExists);
 
   ::close(FileDescriptor);
-  ::remove(TempPath.c_str());
+  ASSERT_FALSE(fs::remove(Twine(TempPath), TempFileExists));
+  EXPECT_TRUE(TempFileExists);
 
   ASSERT_FALSE(fs::exists(Twine(TempPath), TempFileExists));
   EXPECT_FALSE(TempFileExists);