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-rw-r--r--toolkit/modules/LoadContextInfo.jsm15
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diff --git a/toolkit/modules/LoadContextInfo.jsm b/toolkit/modules/LoadContextInfo.jsm
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * This jsm is here only for compatibility. Extension developers may use it
+ * to build nsILoadContextInfo to pass down to HTTP cache APIs. Originally
+ * it was possible to implement nsILoadContextInfo in JS. But now it turned
+ * out to be a built-in class only, so we need a component (service) as
+ * a factory to build nsILoadContextInfo in a JS code.
+ */
+
+this.EXPORTED_SYMBOLS = ["LoadContextInfo"];
+this.LoadContextInfo = Components.classes["@mozilla.org/load-context-info-factory;1"]
+ .getService(Components.interfaces.nsILoadContextInfoFactory);