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--- a/js/public/StructuredClone.h
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+++ b/js/public/StructuredClone.h
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@@ -381,7 +381,7 @@ enum OwnTransferablePolicy {
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 namespace js {
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 class SharedArrayRawBuffer;
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-class SharedArrayRawBufferRefs {
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+class JS_PUBLIC_API SharedArrayRawBufferRefs {
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  public:
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   SharedArrayRawBufferRefs() = default;
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   SharedArrayRawBufferRefs(SharedArrayRawBufferRefs&& other) = default;
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--