Mark overridden destructors with 'override' and remove 'virtual'

This silences a new warning in clang 5.0

Change-Id: Ieb5b75a6ffed60107c3fd16075d2ecfd515b55e8
Reviewed-on: https://skia-review.googlesource.com/10006
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Mike Klein <mtklein@chromium.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/bench/ResultsWriter.h b/bench/ResultsWriter.h
index 1d6dc3eef1..85c44136fe 100644
--- a/bench/ResultsWriter.h
+++ b/bench/ResultsWriter.h
@@ -85,7 +85,7 @@ public:
         , fBench(nullptr)
         , fConfig(nullptr) {}
 
-    ~NanoJSONResultsWriter() {
+    ~NanoJSONResultsWriter() override {
         this->flush();
     }