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

include/effects/SkPixelXorXfermode.h

Index: include/effects/SkPixelXorXfermode.h
diff --git a/include/effects/SkPixelXorXfermode.h b/include/effects/SkPixelXorXfermode.h
index 275bc1755967969e241afc4ff71a27b276463b5d..ccc61458cb716a1b7f8ef1de9a0bb28c857cb319 100644
--- a/include/effects/SkPixelXorXfermode.h
+++ b/include/effects/SkPixelXorXfermode.h
@@ -26,10 +26,10 @@ public:
 
 protected:
     explicit SkPixelXorXfermode(SkColor opColor) : fOpColor(opColor) {}
-    virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE;
+    void flatten(SkWriteBuffer&) const SK_OVERRIDE;
 
     // override from SkXfermode
-    virtual SkPMColor xferColor(SkPMColor src, SkPMColor dst) const SK_OVERRIDE;
+    SkPMColor xferColor(SkPMColor src, SkPMColor dst) const SK_OVERRIDE;
 
 private:
     SkColor fOpColor;