RewriteElseBlocks.cpp: add missing override

Change-Id: Ic98de554cabffabd3cdd58b2a44a554cb2c3cd53
Reviewed-on: https://chromium-review.googlesource.com/302464
Tryjob-Request: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Corentin Wallez <cwallez@chromium.org>
diff --git a/src/compiler/translator/RewriteElseBlocks.cpp b/src/compiler/translator/RewriteElseBlocks.cpp
index 11916b6..52ede17 100644
--- a/src/compiler/translator/RewriteElseBlocks.cpp
+++ b/src/compiler/translator/RewriteElseBlocks.cpp
@@ -23,7 +23,7 @@
     ElseBlockRewriter();
 
   protected:
-    bool visitAggregate(Visit visit, TIntermAggregate *aggregate);
+    bool visitAggregate(Visit visit, TIntermAggregate *aggregate) override;
 
   private:
     const TType *mFunctionType;