Remove calls to deprecated MessageLoop methods in net.

net/dns/dns_config_service_posix_unittest.cc

Index: net/dns/dns_config_service_posix_unittest.cc
diff --git a/net/dns/dns_config_service_posix_unittest.cc b/net/dns/dns_config_service_posix_unittest.cc
index c1ade5308049d9a4cb6fb6604920ff3dbd044bcc..35fcbab3500040aa45c7526d1af6708c6136ac09 100644
--- a/net/dns/dns_config_service_posix_unittest.cc
+++ b/net/dns/dns_config_service_posix_unittest.cc
@@ -4,9 +4,12 @@
 
 #include <resolv.h>
 
+#include <memory>
+
 #include "base/cancelable_callback.h"
 #include "base/files/file_util.h"
-#include "base/message_loop/message_loop.h"
+#include "base/memory/ptr_util.h"
+#include "base/run_loop.h"
 #include "base/sys_byteorder.h"
 #include "base/test/test_timeouts.h"
 #include "base/threading/platform_thread.h"
@@ -208,7 +211,7 @@ class DnsConfigServicePosixTest : public testing::Test {
   void OnConfigChanged(const DnsConfig& config) {
     EXPECT_TRUE(config.IsValid());
     seen_config_ = true;
-    base::MessageLoop::current()->QuitWhenIdle();
+    run_loop_->QuitWhenIdle();
   }
 
   void WriteMockHostsFile(const char* hosts_string) {
@@ -267,7 +270,8 @@ class DnsConfigServicePosixTest : public testing::Test {
 
   void ExpectChange() {
     EXPECT_FALSE(seen_config_);
-    base::MessageLoop::current()->Run();
+    run_loop_ = base::MakeUnique<base::RunLoop>();
+    run_loop_->Run();
     EXPECT_TRUE(seen_config_);
     seen_config_ = false;
   }
@@ -277,6 +281,7 @@ class DnsConfigServicePosixTest : public testing::Test {
   base::FilePath temp_file_;
   std::unique_ptr<DnsConfigServicePosix> service_;
   DnsConfig test_config_;
+  std::unique_ptr<base::RunLoop> run_loop_;
 };
 
 TEST_F(DnsConfigServicePosixTest, SeenChangeSinceNetworkChange) {