Add server_url and mime_type params to CreateUploader.

ios/chrome/browser/metrics/ios_chrome_metrics_service_client.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.
 
 #include "ios/chrome/browser/metrics/ios_chrome_metrics_service_client.h"
 
 #include <stdint.h>
 
 #include <utility>
 #include <vector>
@@ skipping 133 matching lines @@
     // |FinishedReceivingProfilerData()| when the task completes.
     metrics::TrackingSynchronizer::FetchProfilerDataAsynchronously(
         weak_ptr_factory_.GetWeakPtr());
   } else {
     CollectFinalHistograms();
   }
 }
 
 std::unique_ptr<metrics::MetricsLogUploader>
 IOSChromeMetricsServiceClient::CreateUploader(
+    const std::string& server_url,
+    const std::string& mime_type,
     const base::Callback<void(int)>& on_upload_complete) {
   return base::MakeUnique<metrics::NetMetricsLogUploader>(
       GetApplicationContext()->GetSystemURLRequestContext(),
-      metrics::kDefaultMetricsServerUrl, metrics::kDefaultMetricsMimeType,
-      on_upload_complete);
+      server_url, mime_type, on_upload_complete);
 }
 
 base::TimeDelta IOSChromeMetricsServiceClient::GetStandardUploadInterval() {
   return metrics::GetUploadInterval();
 }
 
 base::string16 IOSChromeMetricsServiceClient::GetRegistryBackupKey() {
   return base::string16();
 }
 
@@ skipping 147 matching lines @@
 
 void IOSChromeMetricsServiceClient::OnURLOpenedFromOmnibox(OmniboxLog* log) {
   metrics_service_->OnApplicationNotIdle();
 }
 
 metrics::EnableMetricsDefault
 IOSChromeMetricsServiceClient::GetMetricsReportingDefaultState() {
   return metrics::GetMetricsReportingDefaultState(
       GetApplicationContext()->GetLocalState());
 }