Fix up all the easy virtual ... SK_OVERRIDE cases.

bench/GMBench.h

Index: bench/GMBench.h
diff --git a/bench/GMBench.h b/bench/GMBench.h
index e2240528278ad588497663a1121a449858766d44..43ca9812a18433a751a00f408e7579e700a10b10 100644
--- a/bench/GMBench.h
+++ b/bench/GMBench.h
@@ -21,10 +21,10 @@ public:
     virtual ~GMBench();
 
 protected:
-    virtual const char* onGetName() SK_OVERRIDE;
-    virtual bool isSuitableFor(Backend backend) SK_OVERRIDE;
-    virtual void onDraw(const int loops, SkCanvas* canvas) SK_OVERRIDE;
-    virtual SkIPoint onGetSize() SK_OVERRIDE;
+    const char* onGetName() SK_OVERRIDE;
+    bool isSuitableFor(Backend backend) SK_OVERRIDE;
+    void onDraw(const int loops, SkCanvas* canvas) SK_OVERRIDE;
+    SkIPoint onGetSize() SK_OVERRIDE;
 
 private:
     skiagm::GM* fGM;