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

tests/PixelRefTest.cpp

Index: tests/PixelRefTest.cpp
diff --git a/tests/PixelRefTest.cpp b/tests/PixelRefTest.cpp
index d1d3026f8d6154175b46d537973b0273ce3dfe1f..b9a28244ec8e9b11b5cf18133c45bb4d59681bcd 100644
--- a/tests/PixelRefTest.cpp
+++ b/tests/PixelRefTest.cpp
@@ -6,7 +6,7 @@
 class TestListener : public SkPixelRef::GenIDChangeListener {
 public:
     explicit TestListener(int* ptr) : fPtr(ptr) {}
-    virtual void onChange() SK_OVERRIDE { (*fPtr)++; }
+    void onChange() SK_OVERRIDE { (*fPtr)++; }
 private:
     int* fPtr;
 };