Allow features to refer to subkeys in _manifest_features.json.

chrome/common/extensions/extension_manifest_constants.h

 // 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.
 
 #ifndef CHROME_COMMON_EXTENSIONS_EXTENSION_MANIFEST_CONSTANTS_H_
 #define CHROME_COMMON_EXTENSIONS_EXTENSION_MANIFEST_CONSTANTS_H_
 #pragma once
 
 #include <string>
 
@@ skipping 152 matching lines @@
   extern const char kCannotChangeExtensionID[];
   extern const char kCannotClaimAllHostsInExtent[];
   extern const char kCannotClaimAllURLsInExtent[];
   extern const char kCannotScriptGallery[];
   extern const char kCannotUninstallManagedExtension[];
   extern const char kChromeVersionTooLow[];
   extern const char kDevToolsExperimental[];
   extern const char kDisabledByPolicy[];
   extern const char kExperimentalFlagRequired[];
   extern const char kExpectString[];
-  extern const char kFeatureNotAllowed[];
   extern const char kInvalidAllFrames[];
   extern const char kInvalidBackground[];
   extern const char kInvalidBackgroundAllowJsAccess[];
   extern const char kInvalidBackgroundCombination[];
   extern const char kInvalidBackgroundScript[];
   extern const char kInvalidBackgroundScripts[];
   extern const char kInvalidBackgroundInHostedApp[];
   extern const char kInvalidBackgroundPersistent[];
   extern const char kInvalidBackgroundPersistentNoPage[];
   extern const char kInvalidBrowserAction[];
@@ skipping 129 matching lines @@
   extern const char kPlatformAppFlagRequired[];
   extern const char kOneUISurfaceOnly[];
   extern const char kReservedMessageFound[];
   extern const char kWebContentMustBeEnabled[];
 #if defined(OS_CHROMEOS)
   extern const char kIllegalPlugins[];
 #endif
 }  // namespace extension_manifest_errors
 
 #endif  // CHROME_COMMON_EXTENSIONS_EXTENSION_MANIFEST_CONSTANTS_H_