Update from chromium https://crrev.com/302282

base/win/enum_variant.h

Index: base/win/enum_variant.h
diff --git a/base/win/enum_variant.h b/base/win/enum_variant.h
index 030f7fdcf87a1a3aad53b95ac814ee70b3c693f1..d978eaa7dda5e80c5e6c4f6d27603df3cdbd2063 100644
--- a/base/win/enum_variant.h
+++ b/base/win/enum_variant.h
@@ -33,10 +33,10 @@ class BASE_EXPORT EnumVariant
   // IEnumVARIANT.
   STDMETHODIMP Next(ULONG requested_count,
                     VARIANT* out_elements,
-                    ULONG* out_elements_received);
-  STDMETHODIMP Skip(ULONG skip_count);
-  STDMETHODIMP Reset();
-  STDMETHODIMP Clone(IEnumVARIANT** out_cloned_object);
+                    ULONG* out_elements_received) override;
+  STDMETHODIMP Skip(ULONG skip_count) override;
+  STDMETHODIMP Reset() override;
+  STDMETHODIMP Clone(IEnumVARIANT** out_cloned_object) override;
 
  private:
   ~EnumVariant();