[FIX] *: correctly use session

Widget has no attribute `session` since the new views.

One should either use `getSession()` or require `web.session` (both
cases are correct).

addons/hr_attendance/static/src/js/greeting_message.js

@@ -23,7 +23,7 @@ var GreetingMessage = Widget.extend({
         // to the (likely) appropriate menu, according to the user access rights
         if(!action.attendance) {
             this.activeBarcode = false;
-            this.session.user_has_group('hr_attendance.group_hr_attendance_user').then(function(has_group) {
+            this.getSession().user_has_group('hr_attendance.group_hr_attendance_user').then(function(has_group) {
                 if(has_group) {
                     self.next_action = 'hr_attendance.hr_attendance_action_kiosk_mode';
                 } else {

addons/hr_attendance/static/src/js/kiosk_confirm.js

@@ -67,7 +67,7 @@ var KioskConfirm = Widget.extend({
 
     start: function () {
         var self = this;
-        self.session.user_has_group('hr_attendance.group_hr_attendance_use_pin').then(function(has_group){
+        this.getSession().user_has_group('hr_attendance.group_hr_attendance_use_pin').then(function(has_group){
             self.use_pin = has_group;
             self.$el.html(QWeb.render("HrAttendanceKioskConfirm", {widget: self}));
             self.start_clock();

addons/point_of_sale/static/src/js/chrome.js

@@ -572,7 +572,7 @@ var Chrome = PosBaseWidget.extend({
         this.started  = new $.Deferred(); // resolves when DOM is online
         this.ready    = new $.Deferred(); // resolves when the whole GUI has been loaded
 
-        this.pos = new models.PosModel(this.session,{chrome:this});
+        this.pos = new models.PosModel(this.getSession(), {chrome:this});
         this.gui = new gui.Gui({pos: this.pos, chrome: this});
         this.chrome = this; // So that chrome's childs have chrome set automatically
         this.pos.gui = this.gui;

addons/web/static/src/js/chrome/abstract_web_client.js

@@ -237,7 +237,7 @@ var AbstractWebClient = Widget.extend(mixins.ServiceProvider, {
     },
     do_reload: function () {
         var self = this;
-        return this.session.session_reload().then(function () {
+        return session.session_reload().then(function () {
             session.load_modules(true).then(
                 self.menu.proxy('do_reload'));
         });

addons/web/static/src/js/chrome/action_manager.js

@@ -895,14 +895,14 @@ var ActionManager = Widget.extend({
                 action: JSON.stringify(action),
                 token: new Date().getTime()
             };
-            var url = self.session.url('/web/report', params);
+            var url = session.url('/web/report', params);
             framework.unblockUI();
             $('<a href="'+url+'" target="_blank"></a>')[0].click();
             return;
         }
         var c = crash_manager;
         return $.Deferred(function (d) {
-            self.session.get_file({
+            session.get_file({
                 url: '/web/report',
                 data: {action: JSON.stringify(action)},
                 complete: framework.unblockUI,