Remove device policy store from PolicyHeaderService since it's not used.

components/policy/core/common/cloud/policy_header_service.cc

 // Copyright 2013 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 "components/policy/core/common/cloud/policy_header_service.h"
 
 #include "base/base64.h"
 #include "base/json/json_writer.h"
 #include "base/memory/ptr_util.h"
 #include "base/values.h"
 #include "components/policy/core/common/cloud/cloud_policy_store.h"
 #include "components/policy/core/common/cloud/policy_header_io_helper.h"
 
 namespace {
 const char kUserDMTokenKey[] = "user_dmtoken";
 const char kUserPolicyTokenKey[] = "user_policy_token";
 const char kVerificationKeyHashKey[] = "verification_key_id";
 }
 
 namespace policy {
 
 PolicyHeaderService::PolicyHeaderService(
     const std::string& server_url,
     const std::string& verification_key_hash,
-    CloudPolicyStore* user_policy_store,
-    CloudPolicyStore* device_policy_store)
+    CloudPolicyStore* user_policy_store)
     : server_url_(server_url),
       verification_key_hash_(verification_key_hash),
-      user_policy_store_(user_policy_store),
-      device_policy_store_(device_policy_store) {
+      user_policy_store_(user_policy_store) {
   user_policy_store_->AddObserver(this);
-  if (device_policy_store_)
-    device_policy_store_->AddObserver(this);
 }
 
 PolicyHeaderService::~PolicyHeaderService() {
   user_policy_store_->RemoveObserver(this);
-  if (device_policy_store_)
-    device_policy_store_->RemoveObserver(this);
 }
 
 std::unique_ptr<PolicyHeaderIOHelper>
 PolicyHeaderService::CreatePolicyHeaderIOHelper(
     scoped_refptr<base::SequencedTaskRunner> task_runner) {
   std::string initial_header_value = CreateHeaderValue();
   std::unique_ptr<PolicyHeaderIOHelper> helper =
       base::MakeUnique<PolicyHeaderIOHelper>(server_url_, initial_header_value,
                                              task_runner);
   helpers_.push_back(helper.get());
@@ skipping 48 matching lines @@
 
 void PolicyHeaderService::OnStoreError(CloudPolicyStore* store) {
   // Do nothing on errors.
 }
 
 std::vector<PolicyHeaderIOHelper*> PolicyHeaderService::GetHelpersForTest() {
   return helpers_;
 }
 
 }  // namespace policy