Backport some tests in...

Backport some tests in /components/autofill/content/renderer/renderer_save_password_progress_logger_unittest.cc 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
/components/autofill/content/renderer/renderer_save_password_progress_logger_unittest.cc.

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

This CL was uploaded by git cl split.

R=kolos@chromium.org

Bug: 891670
Change-Id: I71ab175a4439b84cf6828701c5a7dd1c7c95110d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1787071
Auto-Submit: Gabriel Charette <gab@chromium.org>
Reviewed-by: Maxim Kolosovskiy <kolos@chromium.org>
Commit-Queue: Maxim Kolosovskiy <kolos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693687}

components/autofill/content/renderer/renderer_save_password_progress_logger_unittest.cc

@@ -102,7 +102,7 @@ class TestLogger : public RendererSavePasswordProgressLogger {
 }  // namespace
 
 TEST(RendererSavePasswordProgressLoggerTest, SendLog) {
-  base::test::TaskEnvironment task_environment;
+  base::test::SingleThreadTaskEnvironment task_environment;
   FakeContentPasswordManagerDriver fake_driver;
   mojom::PasswordManagerDriverPtr driver_ptr =
       fake_driver.CreateInterfacePtrAndBind();