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

gm/xfermodes.cpp

Index: gm/xfermodes.cpp
diff --git a/gm/xfermodes.cpp b/gm/xfermodes.cpp
index c8fc1ba876ba0c288af2cff58966c6a841c13616..82d1cef47822b028c92bfff746e334ab06f3ce9e 100644
--- a/gm/xfermodes.cpp
+++ b/gm/xfermodes.cpp
@@ -154,7 +154,7 @@ class XfermodesGM : public GM {
         }
     }
 
-    virtual void onOnceBeforeDraw() SK_OVERRIDE {
+    void onOnceBeforeDraw() SK_OVERRIDE {
         fBG.installPixels(SkImageInfo::Make(2, 2, kARGB_4444_SkColorType,
                                             kOpaque_SkAlphaType),
                           gData, 4);
@@ -168,15 +168,15 @@ public:
     XfermodesGM() {}
 
 protected:
-    virtual SkString onShortName() SK_OVERRIDE {
+    SkString onShortName() SK_OVERRIDE {
         return SkString("xfermodes");
     }
 
-    virtual SkISize onISize() SK_OVERRIDE {
+    SkISize onISize() SK_OVERRIDE {
         return SkISize::Make(1990, 640);
     }
 
-    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
+    void onDraw(SkCanvas* canvas) SK_OVERRIDE {
         canvas->translate(SkIntToScalar(10), SkIntToScalar(20));
 
         const struct {