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

google_apis/gcm/engine/instance_id_delete_token_request_handler.cc

Index: google_apis/gcm/engine/instance_id_delete_token_request_handler.cc
diff --git a/google_apis/gcm/engine/instance_id_delete_token_request_handler.cc b/google_apis/gcm/engine/instance_id_delete_token_request_handler.cc
index 7e5d232cee00c3602962e0141ad5cac7781cd383..b3ef7a8cbeabc58482c4d352b8ebf08e6889da50 100644
--- a/google_apis/gcm/engine/instance_id_delete_token_request_handler.cc
+++ b/google_apis/gcm/engine/instance_id_delete_token_request_handler.cc
@@ -24,8 +24,6 @@ const char kExtraScopeKey[] = "X-scope";
 
 // Response constants.
 const char kTokenPrefix[] = "token=";
-const char kErrorPrefix[] = "Error=";
-const char kInvalidParameters[] = "INVALID_PARAMETERS";
 
 }  // namespace
 
@@ -55,21 +53,7 @@ void InstanceIDDeleteTokenRequestHandler::BuildRequestBody(std::string* body){
 
 UnregistrationRequest::Status
 InstanceIDDeleteTokenRequestHandler::ParseResponse(
-    const net::URLFetcher* source) {
-  std::string response;
-  if (!source->GetResponseAsString(&response)) {
-    DVLOG(1) << "Failed to get response body.";
-    return UnregistrationRequest::NO_RESPONSE_BODY;
-  }
-
-  if (response.find(kErrorPrefix) != std::string::npos) {
-    std::string error = response.substr(
-        response.find(kErrorPrefix) + arraysize(kErrorPrefix) - 1);
-    return error == kInvalidParameters ?
-        UnregistrationRequest::INVALID_PARAMETERS :
-        UnregistrationRequest::UNKNOWN_ERROR;
-  }
-
+    const std::string& response) {
   if (response.find(kTokenPrefix) == std::string::npos)
     return UnregistrationRequest::RESPONSE_PARSING_FAILED;