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

Source/platform/testing/ArenaTestHelpers.h

Index: Source/platform/testing/ArenaTestHelpers.h
diff --git a/Source/platform/testing/ArenaTestHelpers.h b/Source/platform/testing/ArenaTestHelpers.h
index 859c7466761430c5d0eb18b2f903431c784240c8..d9d8ad3a45646758fdee6e2e02aac6bf5c424f7d 100644
--- a/Source/platform/testing/ArenaTestHelpers.h
+++ b/Source/platform/testing/ArenaTestHelpers.h
@@ -44,14 +44,14 @@ public:
         return adoptRef(new TrackedAllocator);
     }
 
-    virtual void* allocate(size_t size) OVERRIDE
+    virtual void* allocate(size_t size) override
     {
         void* result = PODArena::FastMallocAllocator::allocate(size);
         m_allocatedRegions.append(result);
         return result;
     }
 
-    virtual void free(void* ptr) OVERRIDE
+    virtual void free(void* ptr) override
     {
         size_t slot = m_allocatedRegions.find(ptr);
         ASSERT_NE(slot, kNotFound);