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

gm/thinstrokedrects.cpp

Index: gm/thinstrokedrects.cpp
diff --git a/gm/thinstrokedrects.cpp b/gm/thinstrokedrects.cpp
index 7e3e399f891037f4d264e00969b0a8016f33eaa4..40c23e18e261f23137344bdb5e69ce18d58b40dd 100644
--- a/gm/thinstrokedrects.cpp
+++ b/gm/thinstrokedrects.cpp
@@ -17,15 +17,15 @@ public:
     }
 
 protected:
-    virtual SkString onShortName() SK_OVERRIDE {
+    SkString onShortName() SK_OVERRIDE {
         return SkString("thinstrokedrects");
     }
 
-    virtual SkISize onISize() SK_OVERRIDE {
+    SkISize onISize() SK_OVERRIDE {
         return SkISize::Make(240, 320);
     }
 
-    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
+    void onDraw(SkCanvas* canvas) SK_OVERRIDE {
 
         SkPaint paint;
         paint.setColor(SK_ColorWHITE);