Expose WorkerGlobalScope interface in worker environment

Source/core/html/canvas/Int8Array.idl

 /*
  * Copyright (C) 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
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  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 [
-    GlobalContext=WindowAndWorker,
+    GlobalContext=Window&WorkerGlobalScope,
     ConstructorTemplate=TypedArray,
     CustomToV8,
     DoNotCheckConstants
 ] interface Int8Array : ArrayBufferView {
     const unsigned long BYTES_PER_ELEMENT = 1;
 
     readonly attribute unsigned long length;
     Int8Array subarray([Default=Undefined] optional long start, 
                        optional long end);
 
     // void set(Int8Array array, optional in unsigned long offset);
     // void set(sequence<long> array, optional in unsigned long offset);
     void set();
 };