Option Groups with display: none should not show the children option elements

public/platform/WebVector.h

Index: public/platform/WebVector.h
diff --git a/public/platform/WebVector.h b/public/platform/WebVector.h
index e83a2d0d2cd56d627ae2b4d50fed0c0e3fcfa591..b22327bba676842cee2f6a7b08f71356936463d4 100644
--- a/public/platform/WebVector.h
+++ b/public/platform/WebVector.h
@@ -152,6 +152,14 @@ public:
         std::swap(m_size, other.m_size);
     }
 
+    void shrink(size_t size)
+    {
+        BLINK_ASSERT(size <= m_size);
+        for (size_t index = m_size - 1; index >= size; --index)
+            m_ptr[index].~T();
+        m_size = size;
+    }
+
 private:
     void initialize(size_t size)
     {