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

tests/OnceTest.cpp

Index: tests/OnceTest.cpp
diff --git a/tests/OnceTest.cpp b/tests/OnceTest.cpp
index da901f41c4cd793358a62b0e0039f9db2c0a23d2..6ab9cd27ac2ae4a906e6b4ff96513abc17b51d20 100644
--- a/tests/OnceTest.cpp
+++ b/tests/OnceTest.cpp
@@ -39,7 +39,7 @@ public:
     SkOnceFlag* once;
     int* ptr;
 
-    virtual void run() SK_OVERRIDE {
+    void run() SK_OVERRIDE {
         SkOnce(once, add_six, ptr);
     }
 };