Use StringPiece for CreateUploader/NetMetricsLogUploader params.

components/metrics/metrics_log_uploader.cc

Index: components/metrics/metrics_log_uploader.cc
diff --git a/components/metrics/metrics_log_uploader.cc b/components/metrics/metrics_log_uploader.cc
deleted file mode 100644
index 0d67ced66c664f0eb4306eef9e941f30bde2a64f..0000000000000000000000000000000000000000
--- a/components/metrics/metrics_log_uploader.cc
+++ /dev/null
@@ -1,22 +0,0 @@
-// Copyright 2014 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 "components/metrics/metrics_log_uploader.h"
-
-namespace metrics {
-
-MetricsLogUploader::MetricsLogUploader(
-    const std::string& server_url,
-    const std::string& mime_type,
-    MetricServiceType service_type,
-    const base::Callback<void(int)>& on_upload_complete)
-    : server_url_(server_url),
-      mime_type_(mime_type),
-      service_type_(service_type),
-      on_upload_complete_(on_upload_complete) {}
-
-MetricsLogUploader::~MetricsLogUploader() {
-}
-
-}  // namespace metrics