Removed keyboard shortcut.

IPython/html/static/notebook/js/actions.js

@@ -253,14 +253,6 @@ define(['require'
                 env.notebook.delete_cell();
             }
         },
-        'show-other-output':{
-            help: 'show/ignore output from other clients',
-            icon: 'fa-sitemap',
-            help_index: 'gb',
-            handler: function (env) {
-                env.notebook.toggle_ignore_unsolicited_msgs();
-            }
-        },
         'interrupt-kernel':{
             icon: 'fa-stop',
             help_index : 'ha',

IPython/html/static/notebook/js/keyboardmanager.js

@@ -95,7 +95,6 @@ define([
             'space' : 'ipython.scroll-down',
             'down' : 'ipython.select-next-cell',
             'i,i' : 'ipython.interrupt-kernel',
-            'e': 'ipython.show-other-output',
             '0,0' : 'ipython.restart-kernel',
             'd,d' : 'ipython.delete-cell',
             'esc': 'ipython.close-pager',