Remove calls to deprecated MessageLoop methods on Windows and Linux.

net/http/transport_security_persister_unittest.cc

Index: net/http/transport_security_persister_unittest.cc
diff --git a/net/http/transport_security_persister_unittest.cc b/net/http/transport_security_persister_unittest.cc
index 5809c92719f223075c1eb6511dc9d4f6fe0ee042..9d93601e950c66bb1777705c4dfb6c33ac40760a 100644
--- a/net/http/transport_security_persister_unittest.cc
+++ b/net/http/transport_security_persister_unittest.cc
@@ -13,6 +13,8 @@
 #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/threading/thread_task_runner_handle.h"
 #include "net/http/transport_security_state.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ -28,14 +30,15 @@ class TransportSecurityPersisterTest : public testing::Test {
   }
 
   ~TransportSecurityPersisterTest() override {
-    base::MessageLoopForIO::current()->RunUntilIdle();
+    EXPECT_TRUE(base::MessageLoopForIO::IsCurrent());
+    base::RunLoop().RunUntilIdle();
   }
 
   void SetUp() override {
     ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
+    ASSERT_TRUE(base::MessageLoopForIO::IsCurrent());
     persister_.reset(new TransportSecurityPersister(
-        &state_, temp_dir_.path(),
-        base::MessageLoopForIO::current()->task_runner(), false));
+        &state_, temp_dir_.path(), base::ThreadTaskRunnerHandle::Get(), false));
   }
 
  protected: