C++11 override should now be supported by all of {bots,Chrome,Android,Mozilla}

NOPRESUBMIT=true

BUG=skia:
DOCS_PREVIEW= https://skia.org/?cl=1037793002

Review URL: https://codereview.chromium.org/1037793002
diff --git a/gm/shadows.cpp b/gm/shadows.cpp
index 66ad32e..adb34b6 100644
--- a/gm/shadows.cpp
+++ b/gm/shadows.cpp
@@ -29,7 +29,7 @@
     SkRect fRect;
 
 protected:
-    void onOnceBeforeDraw() SK_OVERRIDE {
+    void onOnceBeforeDraw() override {
         this->setBGColor(0xFFDDDDDD);
         fCirclePath.addCircle(SkIntToScalar(20), SkIntToScalar(20), SkIntToScalar(10) );
         fRect.set(SkIntToScalar(10), SkIntToScalar(10),