Remove DeviceMonitorLinux::WillDestroyCurrentMessageLoop().

chrome/browser/chromeos/device/input_service_test_helper.cc

Index: chrome/browser/chromeos/device/input_service_test_helper.cc
diff --git a/chrome/browser/chromeos/device/input_service_test_helper.cc b/chrome/browser/chromeos/device/input_service_test_helper.cc
index 2a060ff32e1680fc75dc97a825623c99ee30c552..7cc5e87b56eb22f9e330e5a6eb71028e4f3c42a2 100644
--- a/chrome/browser/chromeos/device/input_service_test_helper.cc
+++ b/chrome/browser/chromeos/device/input_service_test_helper.cc
@@ -5,6 +5,7 @@
 #include "chrome/browser/chromeos/device/input_service_test_helper.h"
 
 #include "base/bind.h"
+#include "base/memory/ptr_util.h"
 #include "base/run_loop.h"
 #include "chrome/browser/chromeos/device/input_service_proxy.h"
 #include "content/public/browser/browser_thread.h"
@@ -20,7 +21,7 @@ namespace chromeos {
 namespace {
 
 void InitInputServiceOnFileThread() {
-  InputServiceLinux::SetForTesting(new FakeInputServiceLinux());
+  InputServiceLinux::SetForTesting(base::MakeUnique<FakeInputServiceLinux>());
 }
 
 void AddDeviceOnFileThread(const InputDeviceInfo& device) {