Convert some component source sets to static library

components/data_use_measurement/content/BUILD.gn

 # 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.
 
-source_set("content") {
+static_library("content") {
   sources = [
     "data_use_measurement.cc",
     "data_use_measurement.h",
   ]
   deps = [
     "//base",
     "//components/data_use_measurement/core",
     "//components/metrics",
     "//content/public/browser",
     "//net",
   ]
 }
+
 source_set("unit_tests") {
   sources = [
     "data_use_measurement_unittest.cc",
   ]
   testonly = true
   deps = [
     ":content",
     "//base",
     "//components/data_use_measurement/core",
     "//content/public/browser",
     "//net",
     "//net:test_support",
     "//testing/gtest",
     "//url",
   ]
 }