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/glyph_pos.cpp b/gm/glyph_pos.cpp
index ecb9963..dd814cf 100644
--- a/gm/glyph_pos.cpp
+++ b/gm/glyph_pos.cpp
@@ -48,7 +48,7 @@
         return str;
     }
 
-    virtual SkISize onISize() { return SkISize::Make(800, 600); }
+    virtual SkISize onISize() SK_OVERRIDE { return SkISize::Make(800, 600); }
 
     virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
         if (!fProp) {