Remove unused code

src/js/client.js

@@ -1763,24 +1763,6 @@ angular.module('Application').service('Client', ['$http', '$interval', '$timeout
         window.location.href = client.apiOrigin + '/api/v1/cloudron/logout?access_token=' + token;
     };
 
-    // this is ununsed because webadmin uses implicit grant flow
-    Client.prototype.exchangeCodeForToken = function (code, callback) {
-        var data = {
-            grant_type: 'authorization_code',
-            code: code,
-            redirect_uri: window.location.protocol + '//' + window.location.host,
-            client_id: this._clientId,
-            client_secret: this._clientSecret
-        };
-
-        post('/api/v1/oauth/token?response_type=token&client_id=' + this._clientId, data, null, function (error, data, status) {
-            if (error) return callback(error);
-            if (status !== 200) return callback(new ClientError(status, data));
-
-            callback(null, data.access_token);
-        });
-    };
-
     Client.prototype.uploadFile = function (appId, file, progressCallback, callback) {
         var fd = new FormData();
         fd.append('file', file);