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/alphagradients.cpp b/gm/alphagradients.cpp
index 304c523..426acaa 100644
--- a/gm/alphagradients.cpp
+++ b/gm/alphagradients.cpp
@@ -14,11 +14,11 @@
     AlphaGradientsGM() {}
 
 protected:
-    SkString onShortName() SK_OVERRIDE {
+    SkString onShortName() override {
         return SkString("alphagradients");
     }
 
-    SkISize onISize() SK_OVERRIDE {
+    SkISize onISize() override {
         return SkISize::Make(640, 480);
     }
 
@@ -38,7 +38,7 @@
         canvas->drawRect(r, paint);
     }
 
-    void onDraw(SkCanvas* canvas) SK_OVERRIDE {
+    void onDraw(SkCanvas* canvas) override {
         static const struct {
             SkColor fColor0;
             SkColor fColor1;