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

bench/PerlinNoiseBench.cpp

Index: bench/PerlinNoiseBench.cpp
diff --git a/bench/PerlinNoiseBench.cpp b/bench/PerlinNoiseBench.cpp
index 560628f4fdd2914b06cfcc045cb0f218d1329e87..17260a9cb8c6b6fdad1e0b58f8c799825fc80dac 100644
--- a/bench/PerlinNoiseBench.cpp
+++ b/bench/PerlinNoiseBench.cpp
@@ -17,11 +17,11 @@ public:
     }
 
 protected:
-    virtual const char* onGetName() SK_OVERRIDE {
+    const char* onGetName() SK_OVERRIDE {
         return "perlinnoise";
     }
 
-    virtual void onDraw(const int loops, SkCanvas* canvas) SK_OVERRIDE {
+    void onDraw(const int loops, SkCanvas* canvas) SK_OVERRIDE {
         this->test(loops, canvas, 0, 0, SkPerlinNoiseShader::kFractalNoise_Type,
                    0.1f, 0.1f, 3, 0, false);
     }