Backport some tests in /chrome/service to SingleThreadTaskEnvironment

These tests were previously migrated from single-threaded MessageLoop to
a multi-threaded TaskEnvironment (then named ScopedTaskEnvironment) as
part of crbug.com/891670.

//base OWNERS decided in retrospect that it was better to keep a
single-threaded option for TaskEnvironment and introduced
SingleThreadTaskEnvironment. This CL retrofits that decision for
/chrome/service.

This CL is a no-op if it passes CQ.

This CL was uploaded by git cl split.

R=rbpotter@chromium.org

Bug: 891670
Change-Id: Id2b0b9a33e136e76d03363140e120a169f063054
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1786749
Auto-Submit: Gabriel Charette <gab@chromium.org>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693941}

chrome/service/cloud_print/cloud_print_url_fetcher_unittest.cc

@@ -140,8 +140,8 @@ class CloudPrintURLFetcherTest : public testing::Test,
   // we assume that the current thread is the IO thread where the URLFetcher
   // dispatches its requests to.  When we wish to simulate being used from
   // a UI thread, we dispatch a worker thread to do so.
-  base::test::TaskEnvironment task_environment_{
-      base::test::TaskEnvironment::MainThreadType::IO};
+  base::test::SingleThreadTaskEnvironment task_environment_{
+      base::test::SingleThreadTaskEnvironment::MainThreadType::IO};
   scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
   int max_retries_;
   Time start_time_;

chrome/service/cloud_print/connector_settings_unittest.cc

@@ -72,7 +72,7 @@ class ConnectorSettingsTest : public testing::Test {
   }
 
   base::ScopedTempDir temp_dir_;
-  base::test::TaskEnvironment task_environment_;
+  base::test::SingleThreadTaskEnvironment task_environment_;
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
 };
 

chrome/service/cloud_print/printer_job_handler_unittest.cc

@@ -464,8 +464,8 @@ class PrinterJobHandlerTest : public ::testing::Test {
   void BeginTest(int timeout_seconds);
   void MakeJobFetchReturnNoJobs();
 
-  base::test::TaskEnvironment task_environment_{
-      base::test::TaskEnvironment::MainThreadType::IO};
+  base::test::SingleThreadTaskEnvironment task_environment_{
+      base::test::SingleThreadTaskEnvironment::MainThreadType::IO};
   base::OnceClosure active_run_loop_quit_closure_;
   TestURLFetcherCallback url_callback_;
   MockPrinterJobHandlerDelegate jobhandler_delegate_;

chrome/service/service_ipc_server_unittest.cc

@@ -78,8 +78,8 @@ class ServiceIPCServerTest : public ::testing::Test {
 
  protected:
   FakeServiceIPCServerClient service_process_client_;
-  base::test::TaskEnvironment task_environment_{
-      base::test::TaskEnvironment::MainThreadType::UI};
+  base::test::SingleThreadTaskEnvironment task_environment_{
+      base::test::SingleThreadTaskEnvironment::MainThreadType::UI};
   base::Thread io_thread_;
   base::WaitableEvent shutdown_event_;
   std::unique_ptr<ServiceIPCServer> server_;

chrome/service/service_process_prefs_unittest.cc

@@ -27,7 +27,7 @@ class ServiceProcessPrefsTest : public testing::Test {
 
   // The path to temporary directory used to contain the test operations.
   base::ScopedTempDir temp_dir_;
-  base::test::TaskEnvironment task_environment_;
+  base::test::SingleThreadTaskEnvironment task_environment_;
   std::unique_ptr<ServiceProcessPrefs> prefs_;
 };