Remove calls to deprecated MessageLoop methods in net.

This CL (hopefully) removes all calls to these methods in net:
- MessageLoop::PostTask
- MessageLoop::PostDelayedTask
- MessageLoop::DeleteSoon
- MessageLoop::ReleaseSoon
- MessageLoop::Run
- MessageLoop::RunUntilIdle

BUG=616447
R=agl@chromium.org

Review-Url: https://codereview.chromium.org/2315873002
Cr-Commit-Position: refs/heads/master@{#418861}

net/android/network_change_notifier_android_unittest.cc

@@ -8,6 +8,7 @@
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/message_loop/message_loop.h"
+#include "base/run_loop.h"
 #include "net/android/network_change_notifier_android.h"
 #include "net/android/network_change_notifier_delegate_android.h"
 #include "net/base/ip_address.h"
@@ -214,18 +215,18 @@ class BaseNetworkChangeNotifierAndroidTest : public testing::Test {
     delegate_.SetOnline();
     // Note that this is needed because base::ObserverListThreadSafe uses
     // PostTask().
-    base::MessageLoop::current()->RunUntilIdle();
+    base::RunLoop().RunUntilIdle();
   }
 
   void SetOffline() {
     delegate_.SetOffline();
     // See comment above.
-    base::MessageLoop::current()->RunUntilIdle();
+    base::RunLoop().RunUntilIdle();
   }
 
   void FakeMaxBandwidthChange(double max_bandwidth_mbps) {
     delegate_.FakeMaxBandwidthChanged(max_bandwidth_mbps);
-    base::MessageLoop::current()->RunUntilIdle();
+    base::RunLoop().RunUntilIdle();
   }
 
   void FakeNetworkChange(ChangeType change,
@@ -249,13 +250,13 @@ class BaseNetworkChangeNotifierAndroidTest : public testing::Test {
         break;
     }
     // See comment above.
-    base::MessageLoop::current()->RunUntilIdle();
+    base::RunLoop().RunUntilIdle();
   }
 
   void FakePurgeActiveNetworkList(NetworkChangeNotifier::NetworkList networks) {
     delegate_.FakePurgeActiveNetworkList(networks);
     // See comment above.
-    base::MessageLoop::current()->RunUntilIdle();
+    base::RunLoop().RunUntilIdle();
   }
 
   NetworkChangeNotifierDelegateAndroid delegate_;
@@ -422,7 +423,7 @@ TEST_F(NetworkChangeNotifierDelegateAndroidTest,
 TEST_F(NetworkChangeNotifierAndroidTest, InitialSignal) {
   DNSChangeObserver dns_change_observer;
   NetworkChangeNotifier::AddDNSObserver(&dns_change_observer);
-  base::MessageLoop::current()->Run();
+  base::RunLoop().Run();
   EXPECT_EQ(1, dns_change_observer.initial_notifications_count());
   EXPECT_EQ(0, dns_change_observer.change_notifications_count());
   NetworkChangeNotifier::RemoveDNSObserver(&dns_change_observer);

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) {