[PWPBM] Remove 'private'.

Fixes #1004.

common/locale/en-US/options.xml

@@ -1330,23 +1330,6 @@
     </description>
 </item>
 
-<item>
-    <tags>'noprivate' 'private'</tags>
-    <spec>'private'</spec>
-    <type>&option.private.type;</type>
-    <default>&option.private.default;</default>
-    <description>
-        <p>
-            Set the <str>private browsing</str> option. In private browsing mode
-            history, cache files, cookies, form data, passwords, download list
-            entries, local and URL <t>marks</t>, <t>command-line</t> history
-            and macros are available only for the duration of the private
-            browsing session and deleted when returning to normal browsing
-            mode. See also <t>privacy</t>.
-        </p>
-    </description>
-</item>
-
 <item>
     <tags>$&dactyl.idName;_RUNTIME</tags>
     <tags>'rtp' 'runtimepath'</tags>

common/modules/sanitizer.jsm

@@ -598,19 +598,6 @@ var Sanitizer = Module("sanitizer", XPCOM([Ci.nsIObserver, Ci.nsISupportsWeakRef
     },
     options: function initOptions(dactyl, modules) {
         const options = modules.options;
-        if (services.has("privateBrowsing") && "privateBrowsingEnabled" in services.privateBrowsing)
-            options.add(["private", "pornmode"],
-                "Set the 'private browsing' option",
-                "boolean", false,
-                {
-                    initialValue: true,
-                    getter: function () services.privateBrowsing.privateBrowsingEnabled,
-                    setter: function (value) {
-                        if (services.privateBrowsing.privateBrowsingEnabled != value)
-                            services.privateBrowsing.privateBrowsingEnabled = value;
-                    },
-                    persist: false
-                });
 
         options.add(["sanitizeitems", "si"],
             "The default list of private items to sanitize",