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/SkDiffContext.cpp b/tools/skpdiff/SkDiffContext.cpp
index c072c27..c422636 100644
--- a/tools/skpdiff/SkDiffContext.cpp
+++ b/tools/skpdiff/SkDiffContext.cpp
@@ -219,7 +219,7 @@
         fTestPath = testPath;
     }
 
-    void run() SK_OVERRIDE {
+    void run() override {
         fDiffContext->addDiff(fBaselinePath.c_str(), fTestPath.c_str());
     }