Delete the old hotwording integration.

chrome/common/extensions/extension_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_CONSTANTS_H_
 #define CHROME_COMMON_EXTENSIONS_EXTENSION_CONSTANTS_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 58 matching lines @@
 
 // The extension id of the Identity API UI application.
 extern const char kIdentityApiUiAppId[];
 
 // The extension id of the Crosh component app for ChromeOS.
 extern const char kCroshBuiltinAppId[];
 
 // The extension id of the hotword audio verification dialogue app.
 extern const char kHotwordAudioVerificationAppId[];
 
-// The extension id of the hotword voice search trigger extension.
-extern const char kHotwordExtensionId[];
-
 // The extension id of the new (experimental) hotword extension.
 extern const char kHotwordNewExtensionId[];
 
 // The extension id of the hotword shared module.
 extern const char kHotwordSharedModuleId[];
 
 // The extension id of the settings application.
 extern const char kSettingsAppId[];
 
 // The extension id of the Youtube application.
@@ skipping 143 matching lines @@
 // The path part of the file system url used for media file systems.
 extern const char kMediaFileSystemPathPart[];
 
 // The key used for signing some pieces of data from the webstore.
 extern const uint8 kWebstoreSignaturesPublicKey[];
 extern const int kWebstoreSignaturesPublicKeySize;
 
 }  // namespace extension_misc
 
 #endif  // CHROME_COMMON_EXTENSIONS_EXTENSION_CONSTANTS_H_