Remove MessageLoop references in services/device/usb/mojo

MessageLoop is going away soon.

This CL was uploaded by git cl split.

R=rockot@google.com

Bug: 891670
Change-Id: Ifb004a1f5fa5f9801e6b08010e95448cf7feb083
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1878074
Commit-Queue: Ken Rockot <rockot@google.com>
Reviewed-by: Ken Rockot <rockot@google.com>
Auto-Submit: Carlos Caballero <carlscab@google.com>
Cr-Commit-Position: refs/heads/master@{#709094}

services/device/usb/mojo/device_impl_unittest.cc

@@ -20,9 +20,9 @@
 #include "base/containers/queue.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted_memory.h"
-#include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/stl_util.h"
+#include "base/test/task_environment.h"
 #include "mojo/public/cpp/bindings/interface_request.h"
 #include "mojo/public/cpp/bindings/receiver.h"
 #include "mojo/public/cpp/bindings/remote.h"
@@ -162,10 +162,7 @@ class MockUsbDeviceClient : public mojom::UsbDeviceClient {
 
 class USBDeviceImplTest : public testing::Test {
  public:
-  USBDeviceImplTest()
-      : message_loop_(new base::MessageLoop),
-        is_device_open_(false),
-        allow_reset_(false) {}
+  USBDeviceImplTest() : is_device_open_(false), allow_reset_(false) {}
 
   ~USBDeviceImplTest() override = default;
 
@@ -430,7 +427,7 @@ class USBDeviceImplTest : public testing::Test {
     std::move(callback).Run(buffer, std::move(packets));
   }
 
-  std::unique_ptr<base::MessageLoop> message_loop_;
+  base::test::SingleThreadTaskEnvironment task_environment_;
   scoped_refptr<MockUsbDevice> mock_device_;
   scoped_refptr<MockUsbDeviceHandle> mock_handle_;
   bool is_device_open_;

services/device/usb/mojo/device_manager_impl_unittest.cc

@@ -14,8 +14,8 @@
 #include "base/barrier_closure.h"
 #include "base/bind.h"
 #include "base/macros.h"
-#include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
+#include "base/test/task_environment.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "mojo/public/cpp/bindings/associated_receiver.h"
 #include "mojo/public/cpp/bindings/interface_request.h"
@@ -51,7 +51,7 @@ ACTION_P2(ExpectGuidAndThen, expected_guid, callback) {
 
 class USBDeviceManagerImplTest : public testing::Test {
  public:
-  USBDeviceManagerImplTest() : message_loop_(new base::MessageLoop) {
+  USBDeviceManagerImplTest() {
     auto mock_usb_service = std::make_unique<MockUsbService>();
     mock_usb_service_ = mock_usb_service.get();
     device_manager_instance_ =
@@ -62,7 +62,7 @@ class USBDeviceManagerImplTest : public testing::Test {
  protected:
   MockUsbService* mock_usb_service_;
   std::unique_ptr<DeviceManagerImpl> device_manager_instance_;
-  std::unique_ptr<base::MessageLoop> message_loop_;
+  base::test::SingleThreadTaskEnvironment task_environment_;
 };
 
 class MockDeviceManagerClient : public mojom::UsbDeviceManagerClient {