Reduce chrome.exe .text size by 50 KB with static_library

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.
 
 declare_args() {
   # Overrides os name in uma metrics log to "Blimp".
   metrics_use_blimp = false
 }
 
 # These are only used by the blimp team, which has entirely migrated to gn,
 # so this logic is not replicated in the gyp file.
 if (metrics_use_blimp) {
   defines = [ "OVERRIDE_OS_NAME_TO_BLIMP" ]
 }
 
 # GYP version: components/metrics.gypi:metrics
-source_set("metrics") {
+static_library("metrics") {
   sources = [
     "call_stack_profile_metrics_provider.cc",
     "call_stack_profile_metrics_provider.h",
     "clean_exit_beacon.cc",
     "clean_exit_beacon.h",
     "client_info.cc",
     "client_info.h",
     "cloned_install_detector.cc",
     "cloned_install_detector.h",
     "daily_event.cc",
@@ skipping 339 matching lines @@
 
   if (is_linux) {
     sources += [ "serialization/serialization_utils_unittest.cc" ]
     deps += [ ":serialization" ]
   }
 
   if (is_chromeos) {
     deps += [ ":leak_detector_unit_tests" ]
   }
 }