Remove remaining use of the deprecated MessageLoopProxy

components/test_runner/web_test_proxy.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 "components/test_runner/web_test_proxy.h"
 
 #include <cctype>
 
 #include "base/callback_helpers.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/thread_task_runner_handle.h"
 #include "base/trace_event/trace_event.h"
 #include "components/test_runner/accessibility_controller.h"
 #include "components/test_runner/event_sender.h"
 #include "components/test_runner/mock_color_chooser.h"
 #include "components/test_runner/mock_credential_manager_client.h"
 #include "components/test_runner/mock_screen_orientation_client.h"
 #include "components/test_runner/mock_web_speech_recognizer.h"
 #include "components/test_runner/mock_web_user_media_client.h"
 #include "components/test_runner/spell_check_client.h"
 #include "components/test_runner/test_interfaces.h"
@@ skipping 597 matching lines @@
       }
       callback.Run(bitmap);
       return;
     }
 
     callback.Run(drag_image_.getSkBitmap());
     return;
   }
 
   if (test_interfaces_->GetTestRunner()->isPrinting()) {
-    base::MessageLoopProxy::current()->PostTask(
-        FROM_HERE,
-        base::Bind(&WebTestProxyBase::CapturePixelsForPrinting,
-                   base::Unretained(this),
-                   callback));
+    base::ThreadTaskRunnerHandle::Get()->PostTask(
+        FROM_HERE, base::Bind(&WebTestProxyBase::CapturePixelsForPrinting,
+                              base::Unretained(this), callback));
     return;
   }
 
   CaptureCallback* capture_callback = new CaptureCallback(base::Bind(
       &WebTestProxyBase::DidCapturePixelsAsync, base::Unretained(this),
       callback));
   web_widget_->compositeAndReadbackAsync(capture_callback);
   if (blink::WebPagePopup* popup = web_widget_->pagePopup()) {
     capture_callback->set_wait_for_popup(true);
     capture_callback->set_popup_position(popup->positionRelativeToOwner());
@@ skipping 750 matching lines @@
   // to cancel the input method's ongoing composition session.
   if (web_widget_)
     web_widget_->confirmComposition();
 }
 
 blink::WebString WebTestProxyBase::acceptLanguages() {
   return blink::WebString::fromUTF8(accept_languages_);
 }
 
 }  // namespace test_runner