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

tests/OnceTest.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkOnce.h"
 #include "SkRunnable.h"
 #include "SkTaskGroup.h"
@@ skipping 21 matching lines @@
     *x += 6;
 }
 
 namespace {
 
 class Racer : public SkRunnable {
 public:
     SkOnceFlag* once;
     int* ptr;
 
-    virtual void run() SK_OVERRIDE {
+    void run() SK_OVERRIDE {
         SkOnce(once, add_six, ptr);
     }
 };
 
 }  // namespace
 
 DEF_TEST(SkOnce_Multithreaded, r) {
     const int kTasks = 16;
 
     // Make a bunch of tasks that will race to be the first to add six to x.
@@ skipping 19 matching lines @@
 static int gX = 0;
 static void inc_gX() { gX++; }
 
 DEF_TEST(SkOnce_NoArg, r) {
     SK_DECLARE_STATIC_ONCE(once);
     SkOnce(&once, inc_gX);
     SkOnce(&once, inc_gX);
     SkOnce(&once, inc_gX);
     REPORTER_ASSERT(r, 1 == gX);
 }