Revert "Add AppWindow.setVisibleOnAllWorkspaces." (https://codereview.chromium.org/469993003)

extensions/renderer/resources/app_window_custom_bindings.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Custom binding for the app_window API.
 
 var appWindowNatives = requireNative('app_window_natives');
 var runtimeNatives = requireNative('runtime');
 var Binding = require('binding').Binding;
 var Event = require('event_bindings').Event;
@@ skipping 175 matching lines @@
     });
   });
 
   apiFunctions.setHandleRequest('get', function(id) {
     var windows = $Array.filter(chrome.app.window.getAll(), function(win) {
       return win.id == id;
     });
     return windows.length > 0 ? windows[0] : null;
   });
 
-  apiFunctions.setHandleRequest('canSetVisibleOnAllWorkspaces', function() {
-    return /Mac/.test(navigator.platform) || /Linux/.test(navigator.userAgent);
-  });
-
   // This is an internal function, but needs to be bound into a closure
   // so the correct JS context is used for global variables such as
   // currentWindowInternal, appWindowData, etc.
   apiFunctions.setHandleRequest('initializeAppWindow', function(params) {
     currentWindowInternal =
         Binding.create('app.currentWindowInternal').generate();
     var AppWindow = function() {
       this.innerBounds = new Bounds('innerBounds');
       this.outerBounds = new Bounds('outerBounds');
     };
@@ skipping 186 matching lines @@
       constraints[key] = 0;
   });
 
   currentWindowInternal.setSizeConstraints(boundsType, constraints);
 }
 
 exports.binding = appWindow.generate();
 exports.onAppWindowClosed = onAppWindowClosed;
 exports.updateAppWindowProperties = updateAppWindowProperties;
 exports.appWindowShownForTests = onAppWindowShownForTests;