Replace OwningPtr with std::unique_ptr.

This compiles cleanly with lldb/lld/clang-tools-extra/llvm.

llvm-svn: 203279
diff --git a/clang/unittests/Tooling/RefactoringCallbacksTest.cpp b/clang/unittests/Tooling/RefactoringCallbacksTest.cpp
index 9e086d8..c2b331c 100644
--- a/clang/unittests/Tooling/RefactoringCallbacksTest.cpp
+++ b/clang/unittests/Tooling/RefactoringCallbacksTest.cpp
@@ -25,7 +25,7 @@
                      RefactoringCallback &Callback) {
   MatchFinder Finder;
   Finder.addMatcher(AMatcher, &Callback);
-  OwningPtr<tooling::FrontendActionFactory> Factory(
+  std::unique_ptr<tooling::FrontendActionFactory> Factory(
       tooling::newFrontendActionFactory(&Finder));
   ASSERT_TRUE(tooling::runToolOnCode(Factory->create(), Code))
       << "Parsing error in \"" << Code << "\"";