Remove all remaining traces of MessageLoopProxy.

blimp/engine/session/blimp_engine_session.cc

 // Copyright 2015 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 "blimp/engine/session/blimp_engine_session.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/memory/ptr_util.h"
@@ skipping 284 matching lines @@
 void BlimpEngineSession::GetEnginePortForTesting(
     const GetPortCallback& callback) {
   content::BrowserThread::PostTaskAndReplyWithResult(
       content::BrowserThread::IO, FROM_HERE,
       base::Bind(&EngineNetworkComponents::GetPortForTesting,
                  base::Unretained(net_components_.get())),
       callback);
 }
 
 void BlimpEngineSession::RegisterFeatures() {
-  thread_pipe_manager_.reset(new ThreadPipeManager(
-      content::BrowserThread::GetMessageLoopProxyForThread(
-          content::BrowserThread::IO),
-      net_components_->GetBrowserConnectionHandler()));
+  thread_pipe_manager_.reset(
+      new ThreadPipeManager(content::BrowserThread::GetTaskRunnerForThread(
+                                content::BrowserThread::IO),
+                            net_components_->GetBrowserConnectionHandler()));
 
   // Register features' message senders and receivers.
   tab_control_message_sender_ =
       thread_pipe_manager_->RegisterFeature(BlimpMessage::kTabControl, this);
   navigation_message_sender_ =
       thread_pipe_manager_->RegisterFeature(BlimpMessage::kNavigation, this);
   render_widget_feature_.set_render_widget_message_sender(
       thread_pipe_manager_->RegisterFeature(BlimpMessage::kRenderWidget,
                                             &render_widget_feature_));
   render_widget_feature_.set_input_message_sender(
@@ skipping 244 matching lines @@
     parent->AddChild(content);
   content->Show();
 
   tab_ = base::WrapUnique(new Tab(std::move(new_contents), target_tab_id,
                                   &render_widget_feature_,
                                   navigation_message_sender_.get()));
 }
 
 }  // namespace engine
 }  // namespace blimp