drop more llvm:: prefixes on OwningPtr<>

More cleanup after r149798.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@150379 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/arcmt-test/arcmt-test.cpp b/tools/arcmt-test/arcmt-test.cpp
index 2fd1444..0ac7837 100644
--- a/tools/arcmt-test/arcmt-test.cpp
+++ b/tools/arcmt-test/arcmt-test.cpp
@@ -177,7 +177,7 @@
                                  origCI.getMigratorOpts().NoFinalizeRemoval);
   assert(!transforms.empty());
 
-  llvm::OwningPtr<PrintTransforms> transformPrinter;
+  OwningPtr<PrintTransforms> transformPrinter;
   if (OutputTransformations)
     transformPrinter.reset(new PrintTransforms(llvm::outs()));