GCM Engine: Split up reg/unreg UNKNOWN_ERROR to improve metrics

google_apis/gcm/engine/unregistration_request.h

Index: google_apis/gcm/engine/unregistration_request.h
diff --git a/google_apis/gcm/engine/unregistration_request.h b/google_apis/gcm/engine/unregistration_request.h
index 4e58326a42a29944f94cac9cad609f5706a4823d..bdcecd50001ad72336ff2dcf4b2436ffcf650d4a 100644
--- a/google_apis/gcm/engine/unregistration_request.h
+++ b/google_apis/gcm/engine/unregistration_request.h
@@ -50,6 +50,7 @@ class GCM_EXPORT UnregistrationRequest : public net::URLFetcherDelegate {
     HTTP_NOT_OK,              // HTTP response code was not OK.
     UNKNOWN_ERROR,            // Unknown error.
     REACHED_MAX_RETRIES,      // Reached maximum number of retries.
+    DEVICE_REGISTRATION_ERROR,// Chrome is not properly registered.
     // NOTE: Always keep this entry at the end. Add new status types only
     // immediately above this line. Make sure to update the corresponding
     // histogram enum accordingly.
@@ -96,7 +97,7 @@ class GCM_EXPORT UnregistrationRequest : public net::URLFetcherDelegate {
 
     // Parses the HTTP response. It is called after
     // UnregistrationRequest::ParseResponse to proceed the parsing.
-    virtual Status ParseResponse(const net::URLFetcher* source) = 0;
+    virtual Status ParseResponse(std::string response) = 0;
 
     // Reports various UMAs, including status, retry count and completion time.
     virtual void ReportUMAs(Status status,