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-rw-r--r--layout/style/StyleSheet.cpp3
1 files changed, 3 insertions, 0 deletions
diff --git a/layout/style/StyleSheet.cpp b/layout/style/StyleSheet.cpp
index f125cf97e..d4bc94186 100644
--- a/layout/style/StyleSheet.cpp
+++ b/layout/style/StyleSheet.cpp
@@ -6,6 +6,7 @@
#include "mozilla/StyleSheet.h"
+#include "mozilla/dom/BindingDeclarations.h" // for Optional<>
#include "mozilla/dom/CSSRuleList.h"
#include "mozilla/dom/ShadowRoot.h"
#include "mozilla/ServoStyleSheet.h"
@@ -16,6 +17,8 @@
#include "nsIMediaList.h"
#include "nsNullPrincipal.h"
+using namespace mozilla::dom;
+
namespace mozilla {
StyleSheet::StyleSheet(StyleBackendType aType, css::SheetParsingMode aParsingMode)