Revert "Workaround to remove private tabs after File - Exit (for #36)"

This reverts commit f78d3b4.

bootstrap.js

@@ -25,7 +25,6 @@ function shutdown(params, reason) {
 
 var windowsObserver = {
 	initialized: false,
-	_hasQuitObserver: false,
 	init: function(reason) {
 		if(this.initialized)
 			return;
@@ -52,10 +51,6 @@ var windowsObserver = {
 			this.destroyWindow(window, reason);
 		}, this);
 		Services.ww.unregisterNotification(this);
-		if(this._hasQuitObserver) {
-			this._hasQuitObserver = false;
-			Services.obs.removeObserver(this, "quit-application-requested");
-		}
 
 		this.unloadStyles();
 		this.restoreAppButtonWidth();
@@ -77,8 +72,6 @@ var windowsObserver = {
 		}
 		else if(topic == "domwindowclosed")
 			this.destroyWindow(subject, WINDOW_CLOSED);
-		else if(topic == "quit-application-requested")
-			this.closeAllPrivateTabs();
 	},
 
 	handleEvent: function(e) {
@@ -133,13 +126,6 @@ var windowsObserver = {
 		this.ensureTitleModifier(document);
 		this.patchBrowsers(gBrowser, true);
 		window.setTimeout(function() {
-			// Trick to remove private tabs on browser exit: we should call
-			// addObserver() after resource:///modules/sessionstore/SessionStore.jsm
-			// to be notified before SessionStore will save windows data
-			if(!this._hasQuitObserver) {
-				this._hasQuitObserver = true;
-				Services.obs.addObserver(this, "quit-application-requested", false);
-			}
 			// We don't need patched functions right after window "load", so it's better to
 			// apply patches after any other extensions
 			this.patchTabBrowserDND(window, gBrowser, true);
@@ -513,15 +499,6 @@ var windowsObserver = {
 		else
 			this.forgetClosedTab(window);
 	},
-	closeAllPrivateTabs: function() {
-		if(prefs.get("savePrivateTabsInSessions"))
-			return;
-		_log("closeAllPrivateTabs()");
-		this.windows.forEach(function(window) {
-			if(!this.isPrivateWindow(window))
-				this.closePrivateTabs(window);
-		}, this);
-	},
 	closePrivateTabs: function(window) {
 		var gBrowser = window.gBrowser;
 		var tabs = gBrowser.tabs;