Include build/build_config.h in all component updater files.

components/update_client/updater_state_unittest.cc

 // Copyright 2016 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 "base/macros.h"
 #include "base/time/time.h"
 #include "base/version.h"
+#include "build/build_config.h"
 #include "components/update_client/updater_state.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace update_client {
 
 class UpdaterStateTest : public testing::Test {
  public:
   UpdaterStateTest() {}
   ~UpdaterStateTest() override {}
 
@@ skipping 81 matching lines @@
   updater_state.update_policy_ = 0;
   attributes = updater_state.BuildAttributes();
   EXPECT_STREQ("0", attributes.at("updatepolicy").c_str());
 
   updater_state.update_policy_ = -1;
   attributes = updater_state.BuildAttributes();
   EXPECT_STREQ("-1", attributes.at("updatepolicy").c_str());
 }
 
 }  // namespace update_client