Cleanup: Another round of override fixes.

gm/xfermodes.cpp

Index: gm/xfermodes.cpp
diff --git a/gm/xfermodes.cpp b/gm/xfermodes.cpp
index d881ae1e6d48012f37813eb4e5ff714c36e10640..c8fc1ba876ba0c288af2cff58966c6a841c13616 100644
--- a/gm/xfermodes.cpp
+++ b/gm/xfermodes.cpp
@@ -168,15 +168,15 @@ public:
     XfermodesGM() {}
 
 protected:
-    virtual SkString onShortName() {
+    virtual SkString onShortName() SK_OVERRIDE {
         return SkString("xfermodes");
     }
 
-    virtual SkISize onISize() {
+    virtual SkISize onISize() SK_OVERRIDE {
         return SkISize::Make(1990, 640);
     }
 
-    virtual void onDraw(SkCanvas* canvas) {
+    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
         canvas->translate(SkIntToScalar(10), SkIntToScalar(20));
 
         const struct {