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

bench/AlternatingColorPatternBench.cpp

Index: bench/AlternatingColorPatternBench.cpp
diff --git a/bench/AlternatingColorPatternBench.cpp b/bench/AlternatingColorPatternBench.cpp
index b497979a892816642fb813492b768113303d6709..fccc494e69d15986fb83cc0ed84c62c4dd995853 100644
--- a/bench/AlternatingColorPatternBench.cpp
+++ b/bench/AlternatingColorPatternBench.cpp
@@ -108,7 +108,7 @@ public:
     }
 
 protected:
-    virtual const char* onGetName() SK_OVERRIDE {
+    const char* onGetName() SK_OVERRIDE {
         return fName.c_str();
     }
 
@@ -146,7 +146,7 @@ protected:
         }
     }
 
-    virtual void onDraw(const int loops, SkCanvas* canvas) SK_OVERRIDE {
+    void onDraw(const int loops, SkCanvas* canvas) SK_OVERRIDE {
         SkPaint paint;
         paint.setAntiAlias(false);
         paint.setFilterLevel(SkPaint::kLow_FilterLevel);