Replacing the OVERRIDE with override in third_party/WebKit/Source/platform

Source/platform/heap/Visitor.h

Index: Source/platform/heap/Visitor.h
diff --git a/Source/platform/heap/Visitor.h b/Source/platform/heap/Visitor.h
index d310b8abb45534f21a26af698da45dea0bd16555..8e6218c8d15dfea8e30689374b99d1a90117ead9 100644
--- a/Source/platform/heap/Visitor.h
+++ b/Source/platform/heap/Visitor.h
@@ -592,13 +592,13 @@ public:
 
 #define USING_GARBAGE_COLLECTED_MIXIN(TYPE) \
 public: \
-    virtual void adjustAndMark(blink::Visitor* visitor) const OVERRIDE    \
+    virtual void adjustAndMark(blink::Visitor* visitor) const override    \
     { \
         typedef WTF::IsSubclassOfTemplate<typename WTF::RemoveConst<TYPE>::Type, blink::GarbageCollected> IsSubclassOfGarbageCollected; \
         COMPILE_ASSERT(IsSubclassOfGarbageCollected::value, OnlyGarbageCollectedObjectsCanHaveGarbageCollectedMixins); \
         visitor->mark(static_cast<const TYPE*>(this), &blink::TraceTrait<TYPE>::trace); \
     } \
-    virtual bool isHeapObjectAlive(blink::Visitor* visitor) const OVERRIDE  \
+    virtual bool isHeapObjectAlive(blink::Visitor* visitor) const override  \
     { \
         return visitor->isAlive(this); \
     } \