Remove the code that calls the origin migrator

This will have done its job now, everyone's had long enough to
install a newer version of Riot and migrate to the new origin.

Laves the code on the backend that handles it for the time being,
as per comment.

electron_app/src/electron-main.js

@@ -232,6 +232,10 @@ ipcMain.on('ipcCall', async function(ev, payload) {
             }
             break;
         case 'origin_migrate':
+            // NB. The code to call this has now been removed so this
+            // should never be called. This code itself has been removed
+            // with the migration to the riot-desktop repo, with the
+            // expectation that this will become the new home for this code.
             migratingOrigin = true;
             await migrateFromOldOrigin();
             migratingOrigin = false;

src/vector/index.js

@@ -191,14 +191,6 @@ async function loadApp() {
         console.log("Using Electron platform");
         const plaf = new ElectronPlatform();
         PlatformPeg.set(plaf);
-
-        // Electron only: see if we need to do a one-time data
-        // migration
-        if (window.localStorage.getItem('mx_user_id') === null) {
-            console.log("Migrating session from old origin...");
-            await plaf.migrateFromOldOrigin();
-            console.log("Origin migration complete");
-        }
     } else {
         console.log("Using Web platform");
         PlatformPeg.set(new WebPlatform());

src/vector/platform/ElectronPlatform.js

@@ -355,10 +355,6 @@ export default class ElectronPlatform extends VectorBasePlatform {
         window.location.reload(false);
     }
 
-    async migrateFromOldOrigin() {
-        return this._ipcCall('origin_migrate');
-    }
-
     async _ipcCall(name, ...args) {
         const ipcCallId = ++this._nextIpcCallId;
         return new Promise((resolve, reject) => {

src/vector/platform/VectorBasePlatform.js

@@ -173,12 +173,4 @@ export default class VectorBasePlatform extends BasePlatform {
     getDefaultDeviceDisplayName(): string {
         return _t("Unknown device");
     }
-
-    /**
-     * Migrate account data from a previous origin
-     * Used only for the electron app
-     */
-    async migrateFromOldOrigin() {
-        return false;
-    }
 }