Add viewing of error messages from Keystone upon self-update failure.

chrome/browser/mac/keystone_registration.mm

Index: chrome/browser/mac/keystone_registration.mm
diff --git a/chrome/browser/mac/keystone_registration.mm b/chrome/browser/mac/keystone_registration.mm
index 82e26599cd50de8fbb426d3b9a05c677d461ef69..4ff70c35d73c8de1f48d199e96d7ce4ec253f84e 100644
--- a/chrome/browser/mac/keystone_registration.mm
+++ b/chrome/browser/mac/keystone_registration.mm
@@ -31,6 +31,8 @@ NSString* KSRegistrationCheckForUpdateNotification =
     @"KSRegistrationCheckForUpdateNotification";
 NSString* KSRegistrationStatusKey = @"Status";
 NSString* KSRegistrationUpdateCheckErrorKey = @"Error";
+NSString* KSRegistrationUpdateCheckRawResultsKey = @"RawResults";
+NSString* KSRegistrationUpdateCheckRawErrorMessagesKey = @"RawErrorMessages";
 
 NSString* KSRegistrationStartUpdateNotification =
     @"KSRegistrationStartUpdateNotification";