Convert some component source sets to static library

components/proximity_auth/logging/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("logging") {
+static_library("logging") {
   sources = [
     "log_buffer.cc",
     "log_buffer.h",
     "logging.cc",
     "logging.h",
   ]
 
   deps = [
     "//base",
   ]
 }
 
 source_set("unit_tests") {
   testonly = true
   sources = [
     "logging_unittest.cc",
   ]
 
   deps = [
     ":logging",
     "//base/test:test_support",
     "//testing/gtest",
   ]
 }