Revert "[Tooling] [0/1] Refactor FrontendActionFactory::create() to return std::unique_ptr<>"

This reverts commit rL326201

This broke gcc4.8 builds, compiler just segfaults:¬
http://lab.llvm.org:8011/builders/clang-atom-d525-fedora-rel/builds/14909¬
http://lab.llvm.org:8011/builders/clang-x86_64-linux-abi-test/builds/22673¬

llvm-svn: 326204
diff --git a/clang/unittests/Tooling/ExecutionTest.cpp b/clang/unittests/Tooling/ExecutionTest.cpp
index 19e5de7..26db8c6 100644
--- a/clang/unittests/Tooling/ExecutionTest.cpp
+++ b/clang/unittests/Tooling/ExecutionTest.cpp
@@ -79,9 +79,7 @@
 class ReportResultActionFactory : public FrontendActionFactory {
 public:
   ReportResultActionFactory(ExecutionContext *Context) : Context(Context) {}
-  std::unique_ptr<FrontendAction> create() override {
-    return llvm::make_unique<ReportResultAction>(Context);
-  }
+  FrontendAction *create() override { return new ReportResultAction(Context); }
 
 private:
   ExecutionContext *const Context;