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

gm/convexpolyclip.cpp

Index: gm/convexpolyclip.cpp
diff --git a/gm/convexpolyclip.cpp b/gm/convexpolyclip.cpp
index 328cdb5207f763fc957df3b0a986c52b1c871eda..f7aac897c7ce872338e6f5a0ce160e564922c085 100644
--- a/gm/convexpolyclip.cpp
+++ b/gm/convexpolyclip.cpp
@@ -79,11 +79,11 @@ public:
     }
 
 protected:
-    virtual SkString onShortName() SK_OVERRIDE {
+    SkString onShortName() SK_OVERRIDE {
         return SkString("convex_poly_clip");
     }
 
-    virtual SkISize onISize() SK_OVERRIDE {
+    SkISize onISize() SK_OVERRIDE {
         // When benchmarking the saveLayer set of draws is skipped.
         int w = 435;
         if (kBench_Mode != this->getMode()) {
@@ -92,7 +92,7 @@ protected:
         return SkISize::Make(w, 540);
     }
 
-    virtual void onOnceBeforeDraw() SK_OVERRIDE {
+    void onOnceBeforeDraw() SK_OVERRIDE {
         SkPath tri;
         tri.moveTo(5.f, 5.f);
         tri.lineTo(100.f, 20.f);
@@ -135,7 +135,7 @@ protected:
         fBmp = make_bmp(100, 100);
     }
 
-    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
+    void onDraw(SkCanvas* canvas) SK_OVERRIDE {
         SkScalar y = 0;
         static const SkScalar kMargin = 10.f;