Expose WorkerGlobalScope interface in worker environment

Source/core/html/canvas/ArrayBuffer.idl

 /*
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 [
-    GlobalContext=WindowAndWorker,
+    GlobalContext=Window&WorkerGlobalScope,
     CustomConstructor(unsigned long length)
 ] interface ArrayBuffer {
     readonly attribute unsigned long byteLength;
     ArrayBuffer slice(long begin, optional long end);
 };