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

bench/ReadPixBench.cpp

Index: bench/ReadPixBench.cpp
diff --git a/bench/ReadPixBench.cpp b/bench/ReadPixBench.cpp
index 7848ebc7576356171aa9ff34c8f4712756e49856..f019401ea3135a23895ecdda996056de501efb10 100644
--- a/bench/ReadPixBench.cpp
+++ b/bench/ReadPixBench.cpp
@@ -20,11 +20,11 @@ public:
     ReadPixBench() {}
 
 protected:
-    virtual const char* onGetName() SK_OVERRIDE {
+    const char* onGetName() SK_OVERRIDE {
         return "readpix";
     }
 
-    virtual void onDraw(const int loops, SkCanvas* canvas) SK_OVERRIDE {
+    void onDraw(const int loops, SkCanvas* canvas) SK_OVERRIDE {
         canvas->clear(SK_ColorBLACK);
 
         SkISize size = canvas->getDeviceSize();