Use StringPiece for CreateUploader/NetMetricsLogUploader params.

components/metrics/BUILD.gn

 # 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.
 
 import("//testing/test.gni")
 
 static_library("metrics") {
   sources = [
     "call_stack_profile_metrics_provider.cc",
     "call_stack_profile_metrics_provider.h",
@@ skipping 27 matching lines @@
     "log_store.h",
     "machine_id_provider.h",
     "machine_id_provider_stub.cc",
     "machine_id_provider_win.cc",
     "metrics_log.cc",
     "metrics_log.h",
     "metrics_log_manager.cc",
     "metrics_log_manager.h",
     "metrics_log_store.cc",
     "metrics_log_store.h",
-    "metrics_log_uploader.cc",
     "metrics_log_uploader.h",
     "metrics_pref_names.cc",
     "metrics_pref_names.h",
     "metrics_provider.cc",
     "metrics_provider.h",
     "metrics_reporting_default_state.cc",
     "metrics_reporting_default_state.h",
     "metrics_reporting_scheduler.cc",
     "metrics_reporting_scheduler.h",
     "metrics_rotation_scheduler.cc",
@@ skipping 322 matching lines @@
 # Convenience testing target
 test("metrics_unittests") {
   sources = [
     "//components/test/run_all_unittests.cc",
   ]
   deps = [
     ":unit_tests",
     "//components/test:test_support",
   ]
 }