Factor File API's 'partial interface URL' impl into separate files

third_party/WebKit/Source/core/fileapi/URLFileAPI.h

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef URLFileAPI_h
+#define URLFileAPI_h
+
+#include "wtf/Allocator.h"
+#include "wtf/Forward.h"
+
+namespace blink {
+
+class ExceptionState;
+class ExecutionContext;
+class Blob;
+
+class URLFileAPI {
+    STATIC_ONLY(URLFileAPI);
+public:
+    static String createObjectURL(ExecutionContext*, Blob*, ExceptionState&);
+    static void revokeObjectURL(ExecutionContext*, const String&);
+};
+
+} // namespace blink
+
+#endif