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

bench/MagnifierBench.cpp

Index: bench/MagnifierBench.cpp
diff --git a/bench/MagnifierBench.cpp b/bench/MagnifierBench.cpp
index c47dcdc94770a4b232d65b7c3ec57461bc4d9032..39bec98e2884ab048ecb7b1251d6fad834f50124 100644
--- a/bench/MagnifierBench.cpp
+++ b/bench/MagnifierBench.cpp
@@ -22,18 +22,18 @@ public:
     }
 
 protected:
-    virtual const char* onGetName() SK_OVERRIDE {
+    const char* onGetName() SK_OVERRIDE {
         return fIsSmall ? "magnifier_small" : "magnifier_large";
     }
 
-    virtual void onPreDraw() SK_OVERRIDE {
+    void onPreDraw() SK_OVERRIDE {
         if (!fInitialized) {
             make_checkerboard();
             fInitialized = true;
         }
     }
 
-    virtual void onDraw(const int loops, SkCanvas* canvas) SK_OVERRIDE {
+    void onDraw(const int loops, SkCanvas* canvas) SK_OVERRIDE {
         const int w = fIsSmall ? FILTER_WIDTH_SMALL : FILTER_WIDTH_LARGE;
         const int h = fIsSmall ? FILTER_HEIGHT_SMALL : FILTER_HEIGHT_LARGE;
         SkPaint paint;