Revert "unique_ptr-ify ownership of ASTConsumers"

This reverts commit r213307.

Reverting to have some on-list discussion/confirmation about the ongoing
direction of smart pointer usage in the LLVM project.

llvm-svn: 213325
diff --git a/clang/unittests/AST/ExternalASTSourceTest.cpp b/clang/unittests/AST/ExternalASTSourceTest.cpp
index 6a5db6c..5cc2def 100644
--- a/clang/unittests/AST/ExternalASTSourceTest.cpp
+++ b/clang/unittests/AST/ExternalASTSourceTest.cpp
@@ -35,9 +35,9 @@
     return ASTFrontendAction::ExecuteAction();
   }
 
-  virtual std::unique_ptr<ASTConsumer> CreateASTConsumer(CompilerInstance &CI,
-                                                         StringRef InFile) {
-    return llvm::make_unique<ASTConsumer>();
+  virtual ASTConsumer *CreateASTConsumer(CompilerInstance &CI,
+                                         StringRef InFile) {
+    return new ASTConsumer;
   }
 
   IntrusiveRefCntPtr<ExternalASTSource> Source;