Track network stack error codes from UMA and UKM

ios/chrome/today_extension/today_metrics_logger.mm

 // 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.
 
 #import <UIKit/UIKit.h>
 
 #import "ios/chrome/today_extension/today_metrics_logger.h"
 
 #include "base/base64.h"
 #include "base/cpu.h"
@@ skipping 54 matching lines @@
   bool GetBrand(std::string* brand_code) override;
   metrics::SystemProfileProto::Channel GetChannel() override;
   std::string GetVersionString() override;
   void InitializeSystemProfileMetrics(
       const base::Closure& done_callback) override;
   void CollectFinalMetricsForLog(const base::Closure& done_callback) override;
   std::unique_ptr<metrics::MetricsLogUploader> CreateUploader(
       base::StringPiece server_url,
       base::StringPiece mime_type,
       metrics::MetricsLogUploader::MetricServiceType service_type,
-      const base::Callback<void(int)>& on_upload_complete) override;
+      const metrics::MetricsLogUploader::UploadCallback& on_upload_complete)
+      override;
   base::TimeDelta GetStandardUploadInterval() override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TodayMetricsServiceClient);
 };
 
 class TodayMetricsLog : public metrics::MetricsLog {
  public:
   // Creates a new today metrics log of the specified type.
   // TodayMetricsLog is similar to metrics::MetricsLog but allow serialization
@@ skipping 60 matching lines @@
 void TodayMetricsServiceClient::CollectFinalMetricsForLog(
     const base::Closure& done_callback) {
   NOTREACHED();
 }
 
 std::unique_ptr<metrics::MetricsLogUploader>
 TodayMetricsServiceClient::CreateUploader(
     base::StringPiece server_url,
     base::StringPiece mime_type,
     metrics::MetricsLogUploader::MetricServiceType service_type,
-    const base::Callback<void(int)>& on_upload_complete) {
+    const metrics::MetricsLogUploader::UploadCallback& on_upload_complete) {
   NOTREACHED();
   return nullptr;
 }
 
 base::TimeDelta TodayMetricsServiceClient::GetStandardUploadInterval() {
   NOTREACHED();
   return base::TimeDelta::FromSeconds(0);
 }
 
 TodayMetricsLog::TodayMetricsLog(const std::string& client_id,
@@ skipping 130 matching lines @@
 void TodayMetricsLogger::UniqueInconsistencyDetected(
     base::HistogramBase::Inconsistency problem) {
   UMA_HISTOGRAM_ENUMERATION("Histogram.InconsistenciesBrowserUnique", problem,
                             base::HistogramBase::NEVER_EXCEEDED_VALUE);
 }
 
 void TodayMetricsLogger::InconsistencyDetectedInLoggedCount(int amount) {
   UMA_HISTOGRAM_COUNTS("Histogram.InconsistentSnapshotBrowser",
                        std::abs(amount));
 }