Remove use of deprecated MessageLoop methods in components.

components/precache/content/precache_manager_unittest.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/precache/content/precache_manager.h"
 
 #include <stddef.h>
 
 #include <map>
 #include <memory>
@@ skipping 307 matching lines @@
   EXPECT_CALL(history_service_, TopHosts(NumTopHosts(), _))
       .WillOnce(ReturnHosts(
           history::TopHostsList(1, std::make_pair("starting-url.com", 1))));
 
   precache_manager_->StartPrecaching(precache_callback_.GetCallback());
 
   EXPECT_TRUE(precache_manager_->IsPrecaching());
   // Run a task to get unfinished work, and to get hosts.
   for (int i = 0; i < 2; ++i) {
     base::RunLoop run_loop;
-    base::MessageLoop::current()->PostTask(FROM_HERE, run_loop.QuitClosure());
+    base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE,
+                                                  run_loop.QuitClosure());
     run_loop.Run();
   }
   // base::RunLoop().RunUntilIdle();
   precache_manager_->CancelPrecaching();
   EXPECT_FALSE(precache_manager_->IsPrecaching());
 
   base::RunLoop().RunUntilIdle();  // For PrecacheFetcher.
   EXPECT_FALSE(precache_manager_->IsPrecaching());
   EXPECT_FALSE(precache_callback_.was_on_done_called());
 
@@ skipping 179 matching lines @@
   expected_histogram_count_map["Precache.Saved"] += 2;
 
   base::RunLoop().RunUntilIdle();
   EXPECT_THAT(histograms_.GetTotalCountsForPrefix("Precache."),
               ContainerEq(expected_histogram_count_map));
 }
 
 }  // namespace
 
 }  // namespace precache