Always declare window.URL even if undefined
Otherwise it breaks feature detection, "ReferenceError: Can't find variabl: URL" in Safari 5.1
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				@ -94,7 +94,7 @@ if (typeof PDFJS === 'undefined') {
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// URL = URL || webkitURL
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(function normalizeURLObject() {
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  if (!window.URL && window.webkitURL) {
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  if (!window.URL) {
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    window.URL = window.webkitURL;
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  }
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})();
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