Revert "Identity API: Add component app for auth flow UI"

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 a545d0af0b1c7fa4e073ed452ba066cb770dcf32..1d3447020717ac422a3c8e7bde37899dbb4c6cbb 100644
--- a/chrome/common/extensions/extension_constants.h
+++ b/chrome/common/extensions/extension_constants.h
@@ -167,9 +167,6 @@ namespace extension_misc {
   // The extension id of the Youtube application.
   extern const char kYoutubeAppId[];
 
-  // The extension id of the Identity API UI application.
-  extern const char kIdentityApiUiAppId[];
-
   // The extension id of the in-app payments support application.
   extern const char kInAppPaymentsSupportAppId[];