Add a ref-counted data holder to ArrayBufferContents

Source/bindings/templates/interface.cpp

Index: Source/bindings/templates/interface.cpp
diff --git a/Source/bindings/templates/interface.cpp b/Source/bindings/templates/interface.cpp
index 4059005269323210e0aae28bc8300c47630e1598..d5f90dcdd22c82c3ff977abad6b3f2dfd9d8446f 100644
--- a/Source/bindings/templates/interface.cpp
+++ b/Source/bindings/templates/interface.cpp
@@ -725,7 +725,7 @@ v8::Local<v8::Object> {{v8_class}}::findInstanceInPrototypeChain(v8::Local<v8::V
     // Transfer the ownership of the allocated memory to an ArrayBuffer without
     // copying.
     v8::ArrayBuffer::Contents v8Contents = v8buffer->Externalize();
-    WTF::ArrayBufferContents contents(v8Contents.Data(), v8Contents.ByteLength());
+    WTF::ArrayBufferContents contents(v8Contents.Data(), v8Contents.ByteLength(), WTF::ArrayBufferContents::NotShared);
     RefPtr<{{cpp_class}}> buffer = {{cpp_class}}::create(contents);
     buffer->associateWithWrapper(v8::Isolate::GetCurrent(), buffer->wrapperTypeInfo(), object);