[Sync::Consent::Cleanup] Delete UserEventService and ConsentAuditor .cc.

Delete .cc files of UserEventService and ConsentAuditor interfaces.

Change-Id: Ic5f19f38b65359365dde91441e95426c0fafcd08
Reviewed-on: https://chromium-review.googlesource.com/1135310Reviewed-by: Markus Heintz <markusheintz@chromium.org>
Commit-Queue: vitaliii <vitaliii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584037}

components/consent_auditor/BUILD.gn

@@ -8,7 +8,6 @@ if (is_android) {
 
 static_library("consent_auditor") {
   sources = [
-    "consent_auditor.cc",
     "consent_auditor.h",
     "consent_auditor_impl.cc",
     "consent_auditor_impl.h",

components/consent_auditor/consent_auditor.cc

-// Copyright 2017 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/consent_auditor/consent_auditor.h"
-
-namespace consent_auditor {
-
-ConsentAuditor::ConsentAuditor() {}
-
-ConsentAuditor::~ConsentAuditor() {}
-
-}  // namespace consent_auditor

components/consent_auditor/consent_auditor.h

@@ -45,8 +45,8 @@ enum class ConsentStatus { NOT_GIVEN, GIVEN };
 // fully launched.
 class ConsentAuditor : public KeyedService {
  public:
-  ConsentAuditor();
-  ~ConsentAuditor() override;
+  ConsentAuditor() = default;
+  ~ConsentAuditor() override = default;
 
   // Records the ARC Play |consent| for the signed-in GAIA account with the ID
   // |account_id| (as defined in AccountInfo).

components/sync/BUILD.gn

@@ -544,7 +544,6 @@ jumbo_static_library("sync") {
     "user_events/no_op_user_event_service.h",
     "user_events/trial_recorder.cc",
     "user_events/trial_recorder.h",
-    "user_events/user_event_service.cc",
     "user_events/user_event_service.h",
     "user_events/user_event_service_impl.cc",
     "user_events/user_event_service_impl.h",

components/sync/user_events/user_event_service.cc

-// Copyright 2017 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/sync/user_events/user_event_service.h"
-
-namespace syncer {
-
-UserEventService::UserEventService() {}
-
-UserEventService::~UserEventService() {}
-
-}  // namespace syncer

components/sync/user_events/user_event_service.h

@@ -19,8 +19,8 @@ class ModelTypeSyncBridge;
 
 class UserEventService : public KeyedService {
  public:
-  UserEventService();
-  ~UserEventService() override;
+  UserEventService() = default;
+  ~UserEventService() override = default;
 
   // Records a given event to be reported. Relevant settings will be checked to
   // verify user events should be emitted and this will no-op if the the