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

google_apis/gcm/engine/instance_id_delete_token_request_handler.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "google_apis/gcm/engine/instance_id_delete_token_request_handler.h"
 
 #include "base/macros.h"
 #include "base/metrics/histogram.h"
 #include "base/strings/string_number_conversions.h"
 #include "google_apis/gcm/base/gcm_util.h"
 #include "net/url_request/url_fetcher.h"
 #include "net/url_request/url_request_context_getter.h"
 
 namespace gcm {
 
 namespace {
 
 // Request constants.
 const char kGMSVersionKey[] = "gmsv";
 const char kInstanceIDKey[] = "appid";
 const char kSenderKey[] = "sender";
 const char kScopeKey[] = "scope";
 const char kExtraScopeKey[] = "X-scope";
 
 // Response constants.
 const char kTokenPrefix[] = "token=";
-const char kErrorPrefix[] = "Error=";
-const char kInvalidParameters[] = "INVALID_PARAMETERS";
 
 }  // namespace
 
 InstanceIDDeleteTokenRequestHandler::InstanceIDDeleteTokenRequestHandler(
     const std::string& instance_id,
     const std::string& authorized_entity,
     const std::string& scope,
     int gcm_version)
     : instance_id_(instance_id),
       authorized_entity_(authorized_entity),
       scope_(scope),
       gcm_version_(gcm_version) {
   DCHECK(!instance_id.empty());
   DCHECK(!authorized_entity.empty());
   DCHECK(!scope.empty());
 }
 
 InstanceIDDeleteTokenRequestHandler::~InstanceIDDeleteTokenRequestHandler() {}
 
 void InstanceIDDeleteTokenRequestHandler::BuildRequestBody(std::string* body){
   BuildFormEncoding(kInstanceIDKey, instance_id_, body);
   BuildFormEncoding(kSenderKey, authorized_entity_, body);
   BuildFormEncoding(kScopeKey, scope_, body);
   BuildFormEncoding(kExtraScopeKey, scope_, body);
   BuildFormEncoding(kGMSVersionKey, base::IntToString(gcm_version_), 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;
-  }
-
+    std::string response) {
   if (response.find(kTokenPrefix) == std::string::npos)
     return UnregistrationRequest::RESPONSE_PARSING_FAILED;
 
   return UnregistrationRequest::SUCCESS;
 }
 
 void InstanceIDDeleteTokenRequestHandler::ReportUMAs(
     UnregistrationRequest::Status status,
     int retry_count,
     base::TimeDelta complete_time) {
   UMA_HISTOGRAM_ENUMERATION("InstanceID.DeleteToken.RequestStatus",
                             status,
                             UnregistrationRequest::UNREGISTRATION_STATUS_COUNT);
 
   // Other UMAs are only reported when the request succeeds.
   if (status != UnregistrationRequest::SUCCESS)
     return;
 
   UMA_HISTOGRAM_COUNTS("InstanceID.DeleteToken.RetryCount", retry_count);
   UMA_HISTOGRAM_TIMES("InstanceID.DeleteToken.CompleteTime", complete_time);
 }
 
 }  // namespace gcm