Implement WebPushProvider.unregister() in Chromium.

content/public/common/push_messaging_status.h

Index: content/public/common/push_messaging_status.h
diff --git a/content/public/common/push_messaging_status.h b/content/public/common/push_messaging_status.h
index 5469c9eabfbb62df5e9eb958d5b31e8d23ed1fa3..b9cac4dfa1a94dfe8e804b3833fb77665a57c25c 100644
--- a/content/public/common/push_messaging_status.h
+++ b/content/public/common/push_messaging_status.h
@@ -90,6 +90,21 @@ enum PushDeliveryStatus {
   PUSH_DELIVERY_STATUS_LAST = PUSH_DELIVERY_STATUS_EVENT_WAITUNTIL_REJECTED
 };
 
+// Push unregistration success / error codes for internal use & reporting.
+enum PushUnregistrationStatus {

[johnme, 2014/12/16 16:31:59]

Please move this above PushGetRegistrationStatus. Remember
[Register,Unregister,GetRegistration,HasPermission,Delivery].

[mlamouri (slow - plz ping), 2014/12/16 18:26:16]

Done.

+  // The unregistration was successful.
+  PUSH_UNREGISTRATION_SUCCESS_UNREGISTER,

[johnme, 2014/12/16 16:31:59]

PUSH_UNREGISTRATION_STATUS_SUCCESS_UNREGISTERED? Similarly below.

[mlamouri (slow - plz ping), 2014/12/16 18:26:16]

Done.

+
+  // The registration was already unregistered.
+  PUSH_UNREGISTRATION_SUCCESS_WAS_UNREGISTERED,
+
+  // The unregistration did not happen because of a network error.
+  PUSH_UNREGISTRATION_NETWORK_ERROR,
+
+  // The unregistration did not happen because of a miscellaneous error.
+  PUSH_UNREGISTRATION_UNKNOWN_ERROR,
+};
+
 const char* PushRegistrationStatusToString(PushRegistrationStatus status);
 
 }  // namespace content