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/extractbitmap.cpp b/gm/extractbitmap.cpp
index c324483..1b9f018 100644
--- a/gm/extractbitmap.cpp
+++ b/gm/extractbitmap.cpp
@@ -32,15 +32,15 @@
 
 protected:
     // overrides from SkEventSink
-    SkString onShortName() SK_OVERRIDE {
+    SkString onShortName() override {
         return SkString("extractbitmap");
     }
 
-    SkISize onISize() SK_OVERRIDE {
+    SkISize onISize() override {
         return SkISize::Make(600, 600);
     }
 
-    void onDraw(SkCanvas* canvas) SK_OVERRIDE {
+    void onDraw(SkCanvas* canvas) override {
         SkBitmap bitmap;
         create_bitmap(&bitmap);
         int x = bitmap.width() / 2;