Revert of Access SigninErrorProvider through ChromeBrowserProvider.

ios/chrome/browser/signin/signin_util.mm

Index: ios/chrome/browser/signin/signin_util.mm
diff --git a/ios/chrome/browser/signin/signin_util.mm b/ios/chrome/browser/signin/signin_util.mm
index a8d66e7c404e021f809a97e7ada203c2ed170d2d..b4240211ba7c296614062dd1ebe03cc5303f8458 100644
--- a/ios/chrome/browser/signin/signin_util.mm
+++ b/ios/chrome/browser/signin/signin_util.mm
@@ -6,7 +6,6 @@
 
 #include "base/strings/sys_string_conversions.h"
 #include "google_apis/gaia/gaia_auth_util.h"
-#import "ios/public/provider/chrome/browser/chrome_browser_provider.h"
 #import "ios/public/provider/chrome/browser/signin/chrome_identity.h"
 #include "ios/public/provider/chrome/browser/signin/signin_error_provider.h"
 
@@ -27,8 +26,7 @@
 }
 
 bool ShouldHandleSigninError(NSError* error) {
-  ios::SigninErrorProvider* provider =
-      ios::GetChromeBrowserProvider()->GetSigninErrorProvider();
+  ios::SigninErrorProvider* provider = ios::GetSigninErrorProvider();
   return ![provider->GetSigninErrorDomain() isEqualToString:error.domain] ||
          (error.code != provider->GetCode(ios::SigninError::CANCELED) &&
           error.code !=