Eliminate task runner injection from the configurator.

The new task scheduler API makes it possible to simplify the 
configurator and avoid injecting task runners.

Bug: 740992
Change-Id: Iaabdc498993745372cee47193f16f1df4d09f7a2
Reviewed-on: https://chromium-review.googlesource.com/582030
Reviewed-by: David Roger <[email protected]>
Reviewed-by: Joshua Pawlicki <[email protected]>
Reviewed-by: Devlin <[email protected]>
Commit-Queue: Sorin Jianu <[email protected]>
Cr-Commit-Position: refs/heads/master@{#489528}
diff --git a/components/update_client/update_client_unittest.cc b/components/update_client/update_client_unittest.cc
index fca7137..05b872f 100644
--- a/components/update_client/update_client_unittest.cc
+++ b/components/update_client/update_client_unittest.cc
@@ -172,10 +172,12 @@
 
   base::test::ScopedTaskEnvironment scoped_task_environment_;
   base::RunLoop runloop_;
-  base::Closure quit_closure_;
+  const base::Closure quit_closure_ = runloop_.QuitClosure();
 
-  scoped_refptr<update_client::TestConfigurator> config_;
-  std::unique_ptr<TestingPrefServiceSimple> pref_;
+  scoped_refptr<update_client::TestConfigurator> config_ =
+      base::MakeRefCounted<TestConfigurator>();
+  std::unique_ptr<TestingPrefServiceSimple> pref_ =
+      base::MakeUnique<TestingPrefServiceSimple>();
   std::unique_ptr<update_client::PersistedData> metadata_;
 
   DISALLOW_COPY_AND_ASSIGN(UpdateClientTest);
@@ -183,15 +185,7 @@
 
 constexpr int UpdateClientTest::kNumWorkerThreads_;
 
-UpdateClientTest::UpdateClientTest()
-    : scoped_task_environment_(
-          base::test::ScopedTaskEnvironment::MainThreadType::UI),
-      pref_(base::MakeUnique<TestingPrefServiceSimple>()) {
-  quit_closure_ = runloop_.QuitClosure();
-
-  config_ = base::MakeRefCounted<TestConfigurator>(
-      base::CreateSequencedTaskRunnerWithTraits({base::MayBlock()}),
-      base::ThreadTaskRunnerHandle::Get());
+UpdateClientTest::UpdateClientTest() {
   PersistedData::RegisterPrefs(pref_->registry());
   metadata_ = base::MakeUnique<PersistedData>(pref_.get());
 }