Replace MessageLoop::current()->task_runner() with ThreadTaskRunnerHandle::Get().

components/browser_watcher/window_hang_monitor_win.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 "components/browser_watcher/window_hang_monitor_win.h"
 
 #include <utility>
 
 #include "base/callback.h"
 #include "base/files/file_util.h"
 #include "base/location.h"
 #include "base/logging.h"
-#include "base/message_loop/message_loop.h"
 #include "base/strings/string_piece.h"
 #include "base/strings/string_util.h"
+#include "base/threading/thread_task_runner_handle.h"
 #include "base/win/message_window.h"
 
 namespace browser_watcher {
 
 namespace {
 
 // Returns true if the class name for |window| equals |str|.
 bool WindowClassNameEqualsString(HWND window, base::StringPiece16 str) {
   wchar_t class_name[MAX_PATH];
   int str_length = ::GetClassName(window, class_name, MAX_PATH);
@@ skipping 43 matching lines @@
   if (outstanding_ping_) {
     // We have an outstanding ping, disable it and leak it intentionally as
     // if the callback arrives eventually, it'll cause a use-after-free.
     outstanding_ping_->monitor = nullptr;
     outstanding_ping_ = nullptr;
   }
 }
 
 void WindowHangMonitor::Initialize(base::Process process) {
   window_process_ = std::move(process);
-  timer_.SetTaskRunner(base::MessageLoop::current()->task_runner());
+  timer_.SetTaskRunner(base::ThreadTaskRunnerHandle::Get());
 
   ScheduleFindWindow();
 }
 
 void WindowHangMonitor::ScheduleFindWindow() {
   // TODO(erikwright): We could reduce the polling by using WaitForInputIdle,
   // but it is hard to test (requiring a non-Console executable).
   timer_.Start(
       FROM_HERE, ping_interval_,
       base::Bind(&WindowHangMonitor::PollForWindow, base::Unretained(this)));
@@ skipping 93 matching lines @@
   //    at any point after we found it.
   HWND hwnd = FindChromeMessageWindow(window_process_.Pid());
   if (hwnd) {
     SendPing(hwnd);
   } else {
     callback_.Run(WINDOW_VANISHED);
   }
 }
 
 }  // namespace browser_watcher