Remove implementation of Panels on OSes other than ChromeOS.

chrome/test/data/extensions/api_test/window_open/focus/test.js

 // Copyright (c) 2011 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.
 
 var expectFocusChange;
 var createdWinId;
 var focusedWinId;
 var listenDoneCallback;
 
 function resetTest(focused) {
@@ skipping 42 matching lines @@
         chrome.test.callbackPass(checkFocused)
     );
   },
   function defaultHasFocusPopup() {
     resetTest(true);
     chrome.windows.create(
         { 'url': 'blank.html', 'type': 'popup' },
         chrome.test.callbackPass(checkFocused)
     );
   },
-  function defaultUnfocusedPanel() {
-    resetTest(false);
-    chrome.windows.create(
-        { 'url': 'blank.html', 'type': 'panel' },
-        chrome.test.callbackPass(checkUnfocused)
-    );
-  },
   function withFocus() {
     resetTest(true);
     chrome.windows.create(
         { 'url': 'blank.html', 'focused': true },
         chrome.test.callbackPass(checkFocused)
     );
   },
   function withFocusPopup() {
     resetTest(true);
     chrome.windows.create(
         { 'url': 'blank.html', 'focused': true, 'type': 'popup' },
         chrome.test.callbackPass(checkFocused)
     );
   },
-  function withFocusPanel() {
-    resetTest(true);
-    chrome.windows.create(
-        { 'url': 'blank.html', 'focused': true, 'type': 'panel' },
-        chrome.test.callbackPass(checkFocused)
-    );
-  },
   function withoutFocus() {
     resetTest(false);
     chrome.windows.create(
         { 'url': 'blank.html', 'focused': false },
         chrome.test.callbackPass(checkUnfocused)
     );
   },
   function withoutFocusPopup() {
     resetTest(false);
     chrome.windows.create(
         { 'url': 'blank.html', 'focused': false, 'type': 'popup' },
         chrome.test.callbackPass(checkUnfocused)
     );
-  },
-  function withoutFocusPanel() {
-    resetTest(false);
-    chrome.windows.create(
-        { 'url': 'blank.html', 'focused': false, 'type': 'panel' },
-        chrome.test.callbackPass(checkUnfocused)
-    );
   }
 ]);