[scheduling] Use ScopedTaskEnvironment instead of MessageLoop in blacklist

MessageLoop will go away, eventually.

BUG=891670

Change-Id: Ic37cec536c71197401e3fcf479b2b810ed9fff39
Reviewed-on: https://chromium-review.googlesource.com/c/1352323Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Carlos Caballero <carlscab@google.com>
Cr-Commit-Position: refs/heads/master@{#612140}

components/blacklist/opt_out_blacklist/opt_out_blacklist_unittest.cc

@@ -15,11 +15,11 @@
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/memory/ptr_util.h"
-#include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/stl_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/test/metrics/histogram_tester.h"
+#include "base/test/scoped_task_environment.h"
 #include "base/test/simple_test_clock.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/time/time.h"
@@ -271,7 +271,7 @@ class OptOutBlacklistTest : public testing::Test {
   }
 
  protected:
-  base::MessageLoop loop_;
+  base::test::ScopedTaskEnvironment task_environment_;
 
   // Observer to |black_list_|.
   TestOptOutBlacklistDelegate blacklist_delegate_;

components/blacklist/opt_out_blacklist/sql/opt_out_store_sql_unittest.cc

@@ -13,10 +13,10 @@
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
-#include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/test/metrics/histogram_tester.h"
+#include "base/test/scoped_task_environment.h"
 #include "base/test/simple_test_clock.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/time/time.h"
@@ -93,7 +93,7 @@ class OptOutStoreSQLTest : public testing::Test {
   void TearDown() override { DestroyStore(); }
 
  protected:
-  base::MessageLoop message_loop_;
+  base::test::ScopedTaskEnvironment task_environment_;
 
   // The backing SQL store.
   std::unique_ptr<OptOutStoreSQL> store_;