Remove ArcAuthService::GetAuthCodeDeprecated0() implementation.

chrome/browser/chromeos/arc/arc_auth_service.cc

Index: chrome/browser/chromeos/arc/arc_auth_service.cc
diff --git a/chrome/browser/chromeos/arc/arc_auth_service.cc b/chrome/browser/chromeos/arc/arc_auth_service.cc
index a342fc0878629bbb990c39a4211cd71a78bb7bc8..7d0747002b5eecb9fa64b90f43484defebb25655 100644
--- a/chrome/browser/chromeos/arc/arc_auth_service.cc
+++ b/chrome/browser/chromeos/arc/arc_auth_service.cc
@@ -353,11 +353,8 @@ std::string ArcAuthService::GetAndResetAuthCode() {
 void ArcAuthService::GetAuthCodeDeprecated0(
     const GetAuthCodeDeprecated0Callback& callback) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
-  DCHECK(!IsOptInVerificationDisabled());
-  // For robot account we must use RequestAccountInfo because it allows to
-  // specify account type.
-  DCHECK(!IsArcKioskMode());
-  callback.Run(GetAndResetAuthCode());
+  NOTREACHED() << "GetAuthCodeDeprecated0() should no longer be callable";
+  callback.Run(std::string());

[hidehiko, 2016/11/14 07:41:03]

Because this should never be called, we may be able to drop "just in case
callback.Run()" here?

[Luis Héctor Chávez, 2016/11/14 16:07:52]

yeah, we should drop it.

[hidehiko, 2016/11/14 17:54:51]

Done.

 }
 
 void ArcAuthService::GetAuthCodeDeprecated(