Cleanup: More override fixes - another round.

BUG=skia:3075
TEST=ninja -C out/Debug
TBR=reed@google.com

Review URL: https://codereview.chromium.org/831113002
diff --git a/gm/gradtext.cpp b/gm/gradtext.cpp
index 47440f6..11dc29c 100644
--- a/gm/gradtext.cpp
+++ b/gm/gradtext.cpp
@@ -102,7 +102,7 @@
     GradTextGM () {}
 
 protected:
-    virtual SkString onShortName() {
+    virtual SkString onShortName() SK_OVERRIDE {
         return SkString("gradtext");
     }