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

gm/colorfilters.cpp

Index: gm/colorfilters.cpp
diff --git a/gm/colorfilters.cpp b/gm/colorfilters.cpp
index 5af2122dc9d7d46b12d51b75c25271b8cdfabf13..9f278a5b40c62baf6577f184868c303ad40acfd2 100644
--- a/gm/colorfilters.cpp
+++ b/gm/colorfilters.cpp
@@ -49,11 +49,11 @@ protected:
         return SkISize::Make(640, 480);
     }
 
-    virtual uint32_t onGetFlags() const SK_OVERRIDE {
+    uint32_t onGetFlags() const SK_OVERRIDE {
         return kSkipTiled_Flag;
     }
 
-    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
+    void onDraw(SkCanvas* canvas) SK_OVERRIDE {
         SkPaint paint;
         SkRect r;
         r.setWH(600, 50);