Refactor: Inject StatisticsProvider as a dependency of DeviceCloudPolicyInitializer.

chrome/browser/chromeos/policy/fake_device_cloud_policy_initializer.cc

Index: chrome/browser/chromeos/policy/fake_device_cloud_policy_initializer.cc
diff --git a/chrome/browser/chromeos/policy/fake_device_cloud_policy_initializer.cc b/chrome/browser/chromeos/policy/fake_device_cloud_policy_initializer.cc
index 3ed9efccd7a9d1dd4e522b9f17eb90e1ddc4f7df..1ee977533aa3cfc8635ecfb0c79efae25db63aac 100644
--- a/chrome/browser/chromeos/policy/fake_device_cloud_policy_initializer.cc
+++ b/chrome/browser/chromeos/policy/fake_device_cloud_policy_initializer.cc
@@ -14,16 +14,17 @@ namespace policy {
 
 FakeDeviceCloudPolicyInitializer::FakeDeviceCloudPolicyInitializer()
     : DeviceCloudPolicyInitializer(
-          NULL,  // local_state
-          NULL,  // enterprise_service
+          nullptr,  // local_state
+          nullptr,  // enterprise_service
           // background_task_runner
-          scoped_refptr<base::SequencedTaskRunner>(NULL),
-          NULL,  // install_attributes
-          NULL,  // state_keys_broker
-          NULL,  // device_store
-          NULL,  // manager
-          NULL,  // async_caller
-          base::MakeUnique<chromeos::attestation::MockAttestationFlow>()),
+          scoped_refptr<base::SequencedTaskRunner>(nullptr),
+          nullptr,  // install_attributes
+          nullptr,  // state_keys_broker
+          nullptr,  // device_store
+          nullptr,  // manager
+          nullptr,  // async_caller
+          base::MakeUnique<chromeos::attestation::MockAttestationFlow>(),
+          nullptr),  // statistics_provider
       was_start_enrollment_called_(false),
       enrollment_status_(
           EnrollmentStatus::ForStatus(EnrollmentStatus::STATUS_SUCCESS)) {}