Prevent incognito windows from opening when incognito mode is disabled.

chrome/browser/extensions/extension_tabs_module_constants.cc

 // 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.
 
 #include "chrome/browser/extensions/extension_tabs_module_constants.h"
 
 namespace extension_tabs_module_constants {
 
 const char kActiveKey[] = "active";
 const char kAllFramesKey[] = "allFrames";
@@ skipping 57 matching lines @@
 const char kNoCurrentWindowError[] = "No current window";
 const char kNoLastFocusedWindowError[] = "No last-focused window";
 const char kWindowNotFoundError[] = "No window with id: *.";
 const char kTabIndexNotFoundError[] = "No tab at index: *.";
 const char kTabNotFoundError[] = "No tab with id: *.";
 const char kTabStripNotEditableError[] =
     "Tabs cannot be edited right now (user may be dragging a tab).";
 const char kNoSelectedTabError[] = "No selected tab";
 const char kNoHighlightedTabError[] = "No highlighted tab";
 const char kIncognitoModeIsDisabled[] = "Incognito mode is disabled.";
+const char kIncognitoModeIsForced[] = "Incognito mode is forced. "
+    "Cannot open normal windows.";
 const char kURLsNotAllowedInIncognitoError[] = "Cannot open URL \"*\" "
     "in an incognito window.";
 const char kInvalidUrlError[] = "Invalid url: \"*\".";
 const char kInternalVisibleTabCaptureError[] =
     "Internal error while trying to capture visible region of the current tab";
 const char kNotImplementedError[] = "This call is not yet implemented";
 const char kSupportedInWindowsOnlyError[] = "Supported in Windows only";
 
 const char kNoCodeOrFileToExecuteError[] = "No source code or file specified.";
 const char kMoreThanOneValuesError[] = "Code and file should not be specified "
     "at the same time in the second argument.";
 const char kLoadFileError[] = "Failed to load file: \"*\". ";
 const char kCannotDetermineLanguageOfUnloadedTab[] =
     "Cannot determine language: tab not loaded";
 
 }  // namespace extension_tabs_module_constants