Allow extensions to specify that they are not allowed in incognito mode.

extensions/common/manifest_constants.h

 // Copyright 2013 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.
 
 #ifndef EXTENSIONS_COMMON_MANIFEST_CONSTANTS_H_
 #define EXTENSIONS_COMMON_MANIFEST_CONSTANTS_H_
 
 namespace extensions {
 
 // Keys used in JSON representation of extensions.
@@ skipping 177 matching lines @@
 #if defined(OS_CHROMEOS)
 extern const char kFileSystemProviderCapabilities[];
 #endif
 }  // namespace manifest_keys
 
 // Some values expected in manifests.
 namespace manifest_values {
 
 extern const char kApiKey[];
 extern const char kBrowserActionCommandEvent[];
+extern const char kIncognitoNotAllowed[];
 extern const char kIncognitoSplit[];
 extern const char kIncognitoSpanning[];
 extern const char kIsolatedStorage[];
 extern const char kKeybindingPlatformChromeOs[];
 extern const char kKeybindingPlatformDefault[];
 extern const char kKeybindingPlatformLinux[];
 extern const char kKeybindingPlatformMac[];
 extern const char kKeybindingPlatformWin[];
 extern const char kKeyAlt[];
 extern const char kKeyShift[];
@@ skipping 274 matching lines @@
 extern const char kIllegalPlugins[];
 extern const char kInvalidFileSystemProviderMissingCapabilities[];
 extern const char kInvalidFileSystemProviderMissingPermission[];
 #endif
 
 }  // namespace manifest_errors
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_COMMON_MANIFEST_CONSTANTS_H_