Remove Citrix app related constants which are no longer used

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 6092e95ef018dc4b0c636f7971a52fe7e9254ffb..a13c8a3e28231cc2437afda53268c3bc977022b1 100644
--- a/chrome/common/extensions/extension_constants.h
+++ b/chrome/common/extensions/extension_constants.h
@@ -76,15 +76,6 @@ namespace extension_misc {
   // The extension id of the Chrome component application.
   extern const char kChromeAppId[];
 
-  // The extension id of the Citrix Receiver application.
-  extern const char kCitrixReceiverAppId[];
-
-  // The extension id of the beta Citrix Receiver application.
-  extern const char kCitrixReceiverAppBetaId[];
-
-  // The extension id of the dev Citrix Receiver application.
-  extern const char kCitrixReceiverAppDevId[];
-
   // The extension id of the Cloud Print component application.
   extern const char kCloudPrintAppId[];