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/tools/skpdiff/SkCLImageDiffer.h b/tools/skpdiff/SkCLImageDiffer.h
index 177940d..cb9a8d6 100644
--- a/tools/skpdiff/SkCLImageDiffer.h
+++ b/tools/skpdiff/SkCLImageDiffer.h
@@ -26,7 +26,7 @@
 public:
     SkCLImageDiffer();
 
-    bool requiresOpenCL() const SK_OVERRIDE { return true; }
+    bool requiresOpenCL() const override { return true; }
 
     /**
      * Initializes the OpenCL resources this differ needs to work