Delete the old hotwording integration.

chrome/common/extensions/extension_constants.h

Index: chrome/common/extensions/extension_constants.h
diff --git a/chrome/common/extensions/extension_constants.h b/chrome/common/extensions/extension_constants.h
index 699ce8df2460550182ffdea7fdaf0afc62d8ee9c..8f5ff6f78ff0799c6af0e1389922d879edcee013 100644
--- a/chrome/common/extensions/extension_constants.h
+++ b/chrome/common/extensions/extension_constants.h
@@ -76,8 +76,8 @@ 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 old hotword voice search trigger extension.
+extern const char kHotwordOldExtensionId[];
 
 // The extension id of the new (experimental) hotword extension.
 extern const char kHotwordNewExtensionId[];