remove 'const' keyword from react-gradebook

closes CNVS-23962

test plan
  - open the gradebook in IE10 or below
  - ensure the gradebook loads
  - also ensure there are no errors thrown
    on the page by looking at the dev tools

Change-Id: Ia217c2f702f9858f062e351c9ceeed28c8c16cbd
Reviewed-on: https://gerrit.instructure.com/65048
Reviewed-by: Spencer Olson <solson@instructure.com>
QA-Review: Steven Shepherd <sshepherd@instructure.com>
Product-Review: Dylan Ross <dross@instructure.com>
Tested-by: Jenkins

Author: dyro

app/jsx/gradebook/grid/actions/settingsActions.jsx

@@ -3,7 +3,7 @@ define([
   'jquery',
   'jsx/gradebook/grid/constants'
 ], function (Reflux, $, GradebookConstants) {
-  const SAVE_COLUMN_SIZE_URL = GradebookConstants.gradebook_column_size_settings_url;
+  var SAVE_COLUMN_SIZE_URL = GradebookConstants.gradebook_column_size_settings_url;
 
   var SettingsActions = Reflux.createActions([
     'resize',

app/jsx/gradebook/grid/app.jsx

@@ -4,7 +4,7 @@ define([
   'react',
   './components/gradebook'
 ], function (React, Gradebook) {
-  const MOUNT_ELEMENT = document.getElementById('gradebook_grid');
+  var MOUNT_ELEMENT = document.getElementById('gradebook_grid');
 
   React.render(<Gradebook/>, MOUNT_ELEMENT);
 });

app/jsx/gradebook/grid/components/assignmentGradeCell.jsx

@@ -4,18 +4,18 @@ define([
   'compiled/SubmissionDetailsDialog',
   'jsx/gradebook/grid/constants'
 ], function (React, SubmissionDetailsDialog, GradebookConstants) {
-  const GRADED = 'graded',
-        ICON_CLASS = 'icon-',
-        LATE_CLASS = 'late',
-        RESUBMITTED_CLASS = 'resubmiited',
-        SUBMISSION_TYPES = {
-          discussion_topic: 'discussion',
-          online_url: 'link',
-          online_text_entry: 'text',
-          online_upload: 'document',
-          online_quiz: 'quiz',
-          media_recording: 'media'
-        };
+  var GRADED = 'graded',
+      ICON_CLASS = 'icon-',
+      LATE_CLASS = 'late',
+      RESUBMITTED_CLASS = 'resubmiited',
+      SUBMISSION_TYPES = {
+        discussion_topic: 'discussion',
+        online_url: 'link',
+        online_text_entry: 'text',
+        online_upload: 'document',
+        online_quiz: 'quiz',
+        media_recording: 'media'
+      };
 
   var AssignmentGradeCell = React.createClass({
     propTypes: {

app/jsx/gradebook/grid/components/column_types/assignmentPassFail.jsx

@@ -6,8 +6,8 @@ define([
   '../../actions/submissionsActions'
 ], function (React, _, GradeCellMixin, SubmissionsActions) {
 
-  const GRADEBOOK_CHECKBOX_CLASS = 'gradebook-checkbox';
-  const NEXT_GRADE_TYPE = {
+  var GRADEBOOK_CHECKBOX_CLASS = 'gradebook-checkbox';
+  var NEXT_GRADE_TYPE = {
     ''          : 'complete',
     'complete'  : 'incomplete',
     'incomplete': ''

app/jsx/gradebook/grid/components/dropdown_components/moveTotalColumnToggle.jsx

@@ -8,8 +8,8 @@ define([
   'jsx/gradebook/grid/actions/gradebookToolbarActions'
 ], function (React, Reflux, I18n, HeaderDropdownOption, GradebookToolbarStore, GradebookToolbarActions) {
 
-  const TO_END = I18n.t("Move to end"),
-        TO_FRONT = I18n.t("Move to front");
+  var TO_END = I18n.t("Move to end"),
+      TO_FRONT = I18n.t("Move to front");
 
   var MoveTotalColumnToggle = React.createClass({
     mixins: [

app/jsx/gradebook/grid/components/dropdown_components/muteAssignmentOption.jsx

@@ -22,9 +22,9 @@ define([
   AssignmentGroupsActions
 ) {
 
-  const MUTE = I18n.t('Mute Assignment'),
-        UNMUTE = I18n.t('Unmute Assignment'),
-        MUTING_EVENT = 'assignment_muting_toggled';
+  var MUTE = I18n.t('Mute Assignment'),
+      UNMUTE = I18n.t('Unmute Assignment'),
+      MUTING_EVENT = 'assignment_muting_toggled';
 
   var MuteAssignmentOption = React.createClass({
 

app/jsx/gradebook/grid/components/gridCell.jsx

@@ -5,17 +5,17 @@ define([
   './assignmentGradeCell'
 ], function (React, _, AssignmentGradeCell) {
 
-  const GRADEBOOK_CELL_CLASS = 'gradebook-cell',
-        ACTIVE_CLASS = ' active',
-        LATE_CLASS = ' late',
-        RESUBMIITED_CLASS = ' resubmitted',
-        ASSIGNMENT_TYPES = [
-          'percent',
-          'pass_fail',
-          'letter_grade',
-          'points',
-          'gpa_scale',
-        ];
+  var GRADEBOOK_CELL_CLASS = 'gradebook-cell',
+      ACTIVE_CLASS = ' active',
+      LATE_CLASS = ' late',
+      RESUBMIITED_CLASS = ' resubmitted',
+      ASSIGNMENT_TYPES = [
+        'percent',
+        'pass_fail',
+        'letter_grade',
+        'points',
+        'gpa_scale',
+      ];
 
   var GridCell = React.createClass({
     propTypes: {

app/jsx/gradebook/grid/constants.jsx

@@ -1,7 +1,7 @@
 define([
   'underscore'
 ], function (_) {
-  const GRADEBOOK_CONSTANTS = {
+  var GRADEBOOK_CONSTANTS = {
     STUDENT_COLUMN_ID: 'student',
     NOTES_COLUMN_ID: 'notes',
     PERCENT_COLUMN_ID: 'percent',
@@ -49,7 +49,7 @@ define([
     }
   };
 
-  const CONSTANTS = _.extend({}, GRADEBOOK_CONSTANTS, ENV.GRADEBOOK_OPTIONS);
+  var CONSTANTS = _.extend({}, GRADEBOOK_CONSTANTS, ENV.GRADEBOOK_OPTIONS);
 
   return CONSTANTS;
 });

app/jsx/gradebook/grid/stores/settingsStore.jsx

@@ -3,10 +3,10 @@ define([
   'jquery',
   '../actions/settingsActions'
 ], function (Reflux, $, SettingsActions) {
-  const MOUNT_ELEMENT = document.getElementById('gradebook-grid-wrapper'),
-        PADDING = 20,
-        TOOLBAR_HEIGHT = $('#gradebook-toolbar').height(),
-        TOOLBAR_OFFSET = $('#gradebook-toolbar').offset().top;
+  var MOUNT_ELEMENT = document.getElementById('gradebook-grid-wrapper'),
+      PADDING = 20,
+      TOOLBAR_HEIGHT = $('#gradebook-toolbar').height(),
+      TOOLBAR_OFFSET = $('#gradebook-toolbar').offset().top;
 
   var SettingsStore = Reflux.createStore({
     listenables: [SettingsActions],