Revert "content: Remove use of MessageLoopProxy and deprecated MessageLoop APIs"

chrome/browser/printing/cloud_print/test/cloud_print_proxy_process_browsertest.cc

 // Copyright (c) 2012 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.
 
 // Create a service process that uses a Mock to respond to the browser in order
 // to test launching the browser using the cloud print policy check command
 // line switch.
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 289 matching lines @@
 
 class CloudPrintProxyPolicyStartupTest : public base::MultiProcessTest,
                                          public IPC::Listener {
  public:
   CloudPrintProxyPolicyStartupTest();
   ~CloudPrintProxyPolicyStartupTest() override;
 
   void SetUp() override;
   void TearDown() override;
 
-  scoped_refptr<base::SingleThreadTaskRunner> IOTaskRunner() {
+  scoped_refptr<base::MessageLoopProxy> IOMessageLoopProxy() {
     return BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO);
   }
   base::Process Launch(const std::string& name);
   void WaitForConnect();
   bool Send(IPC::Message* message);
   void ShutdownAndWaitForExitWithTimeout(base::Process process);
 
   // IPC::Listener implementation
   bool OnMessageReceived(const IPC::Message& message) override { return false; }
   void OnChannelConnected(int32 peer_pid) override;
@@ skipping 114 matching lines @@
     const std::string& name) {
   EXPECT_FALSE(CheckServiceProcessReady());
 
   startup_channel_id_ =
       base::StringPrintf("%d.%p.%d",
                          base::GetCurrentProcId(), this,
                          base::RandInt(0, std::numeric_limits<int>::max()));
   startup_channel_ = IPC::ChannelProxy::Create(startup_channel_id_,
                                                IPC::Channel::MODE_SERVER,
                                                this,
-                                               IOTaskRunner());
+                                               IOMessageLoopProxy());
 
 #if defined(OS_POSIX)
   base::FileHandleMappingVector ipc_file_list;
   ipc_file_list.push_back(std::make_pair(
       startup_channel_->TakeClientFileDescriptor().release(),
       kPrimaryIPCChannel + base::GlobalDescriptors::kBaseDescriptor));
   base::LaunchOptions options;
   options.fds_to_remap = &ipc_file_list;
   base::Process process = SpawnChildWithOptions(name, options);
 #else
   base::Process process = SpawnChild(name);
 #endif
   EXPECT_TRUE(process.IsValid());
   return process.Pass();
 }
 
 void CloudPrintProxyPolicyStartupTest::WaitForConnect() {
   observer_.Wait();
   EXPECT_TRUE(CheckServiceProcessReady());
   EXPECT_TRUE(base::MessageLoopProxy::current().get());
   ServiceProcessControl::GetInstance()->SetChannel(
       IPC::ChannelProxy::Create(GetServiceProcessChannel(),
                                 IPC::Channel::MODE_NAMED_CLIENT,
                                 ServiceProcessControl::GetInstance(),
-                                IOTaskRunner()));
+                                IOMessageLoopProxy()));
 }
 
 bool CloudPrintProxyPolicyStartupTest::Send(IPC::Message* message) {
   return ServiceProcessControl::GetInstance()->Send(message);
 }
 
 void CloudPrintProxyPolicyStartupTest::ShutdownAndWaitForExitWithTimeout(
     base::Process process) {
   ASSERT_TRUE(Send(new ServiceMsg_Shutdown()));
 
@@ skipping 37 matching lines @@
 }
 
 KeyedService* CloudPrintProxyServiceFactoryForPolicyTest(
     content::BrowserContext* profile) {
   CloudPrintProxyService* service =
       new CloudPrintProxyService(static_cast<Profile*>(profile));
   service->Initialize();
   return service;
 }