Revert "UMA: How often are different network error screens encountered during OOBE"

chrome/browser/ui/webui/chromeos/login/enrollment_screen_handler.h

Index: chrome/browser/ui/webui/chromeos/login/enrollment_screen_handler.h
diff --git a/chrome/browser/ui/webui/chromeos/login/enrollment_screen_handler.h b/chrome/browser/ui/webui/chromeos/login/enrollment_screen_handler.h
index 2836d54d5c91053a24a70e8a509bbc3ed49aabc1..78a97076ab558c650632aa69c6f8915577b1440e 100644
--- a/chrome/browser/ui/webui/chromeos/login/enrollment_screen_handler.h
+++ b/chrome/browser/ui/webui/chromeos/login/enrollment_screen_handler.h
@@ -25,7 +25,6 @@ class PolicyOAuth2TokenFetcher;
 namespace chromeos {
 
 class AuthenticatedUserEmailRetriever;
-class ErrorScreensHistogramHelper;
 
 // WebUIMessageHandler implementation which handles events occurring on the
 // page, such as the user pressing the signin button.
@@ -151,8 +150,6 @@ class EnrollmentScreenHandler
 
   ErrorScreenActor* error_screen_actor_;
 
-  scoped_ptr<ErrorScreensHistogramHelper> histogram_helper_;
-
   base::WeakPtrFactory<EnrollmentScreenHandler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(EnrollmentScreenHandler);