Re-land pref fix for Clear Recent History. b=453440 r=gavin a=blocking-firefox3.1

        sanitize: function ()

        {

          // Update pref values before handing off to the sanitizer (bug 453440)

          this.updatePrefs();

          var s = new Sanitizer();

          s.ignoreTimespan = false;

          s.prefDomain = "privacy.cpd.";

          try {

            s.sanitize();

          } catch (er) {

            Components.utils.reportError("Exception during sanitize: " + er);

          }

          return true;

        },

        onReadGeneric: function ()

          if (history.checked)

            downloads.checked = true;

        },

        updatePrefs : function ()

        {

          var tsPref = document.getElementById("privacy.sanitize.timeSpan");

          Sanitizer.prefs.setIntPref("timeSpan", tsPref.value);

          var sanitizePreferences = document.getElementById("sanitizePreferences");

          var prefs = sanitizePreferences.rootBranch;

          for (var i = 0; i < sanitizePreferences.childNodes.length; ++i) {

            var p = sanitizePreferences.childNodes[i];

            prefs.setBoolPref(p.name, p.value);

          }

        }

      };

    ]]>

    </script>