Remove calls to deprecated MessageLoop methods in chromeos.

chromeos/network/host_resolver_impl_chromeos_unittest.cc

 // Copyright 2014 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 "chromeos/network/host_resolver_impl_chromeos.h"
 
 #include <memory>
 
 #include "base/location.h"
 #include "base/macros.h"
@@ skipping 43 matching lines @@
 
     const chromeos::NetworkState* default_network =
         network_state_handler_->DefaultNetwork();
     ASSERT_TRUE(default_network);
     const chromeos::DeviceState* default_device =
         network_state_handler_->GetDeviceState(default_network->device_path());
     ASSERT_TRUE(default_device);
     SetDefaultIPConfigs(default_device->path());
 
     // Create the host resolver from the IO message loop.
-    io_message_loop_.PostTask(
+    io_message_loop_.task_runner()->PostTask(
         FROM_HERE,
         base::Bind(&HostResolverImplChromeOSTest::InitializeHostResolver,
                    base::Unretained(this)));
-    io_message_loop_.RunUntilIdle();
-
-    // Run the main message loop to create the network observer and initialize
-    // the ip address values.
     base::RunLoop().RunUntilIdle();
   }
 
   void TearDown() override {
     network_state_handler_.reset();
     chromeos::DBusThreadManager::Shutdown();
   }
 
  protected:
   // Run from main (UI) message loop, calls Resolve on IO message loop.
   int CallResolve(net::HostResolver::RequestInfo& info) {
     io_message_loop_.task_runner()->PostTask(
         FROM_HERE, base::Bind(&HostResolverImplChromeOSTest::Resolve,
                               base::Unretained(this), info));
-    io_message_loop_.RunUntilIdle();
+    base::RunLoop().RunUntilIdle();
     return result_;
   }
 
   net::AddressList addresses_;
   int result_;
 
  private:
   // Run from IO message loop.
   void InitializeHostResolver() {
     net::HostResolver::Options options;
@@ skipping 65 matching lines @@
   EXPECT_EQ(expected, addresses_[0].ToString());
 
   info.set_address_family(net::ADDRESS_FAMILY_IPV6);
   EXPECT_EQ(net::OK, CallResolve(info));
   ASSERT_EQ(2u, addresses_.size());
   expected = base::StringPrintf("[%s]:%d", kTestIPv6Address, 0);
   EXPECT_EQ(expected, addresses_[0].ToString());
   expected = base::StringPrintf("%s:%d", kTestIPv4Address, 0);
   EXPECT_EQ(expected, addresses_[1].ToString());
 }