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

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

Index: chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h
diff --git a/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h b/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h
index eb967e6efc5036209b38f425c0137173371d0d2a..1d7067eb8525ce02e97af11f518e3048a5ce7c45 100644
--- a/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h
+++ b/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h
@@ -47,7 +47,6 @@ namespace chromeos {
 class AuthenticatedUserEmailRetriever;
 class CaptivePortalWindowProxy;
 class CoreOobeActor;
-class ErrorScreensHistogramHelper;
 class GaiaScreenHandler;
 class NativeWindowDelegate;
 class SupervisedUserCreationScreenHandler;
@@ -530,8 +529,6 @@ class SigninScreenHandler
   // True if SigninScreenHandler has already been added to OobeUI observers.
   bool oobe_ui_observer_added_;
 
-  scoped_ptr<ErrorScreensHistogramHelper> histogram_helper_;
-
   base::WeakPtrFactory<SigninScreenHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SigninScreenHandler);