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

content/browser/plugin_loader_posix.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.
 
 #include "content/browser/plugin_loader_posix.h"
 
 #include "base/bind.h"
-#include "base/location.h"
+#include "base/message_loop/message_loop.h"
+#include "base/message_loop/message_loop_proxy.h"
 #include "base/metrics/histogram.h"
-#include "base/single_thread_task_runner.h"
-#include "base/thread_task_runner_handle.h"
 #include "content/browser/utility_process_host_impl.h"
 #include "content/common/child_process_host_impl.h"
 #include "content/common/plugin_list.h"
 #include "content/common/utility_messages.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/plugin_service.h"
 #include "content/public/browser/user_metrics.h"
 
 namespace content {
 
 PluginLoaderPosix::PluginLoaderPosix()
     : next_load_index_(0), loading_plugins_(false) {
 }
 
 void PluginLoaderPosix::GetPlugins(
     const PluginService::GetPluginsCallback& callback) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
   std::vector<WebPluginInfo> cached_plugins;
   if (PluginList::Singleton()->GetPluginsNoRefresh(&cached_plugins)) {
     // Can't assume the caller is reentrant.
-    base::ThreadTaskRunnerHandle::Get()->PostTask(
-        FROM_HERE, base::Bind(callback, cached_plugins));
+    base::MessageLoop::current()->PostTask(FROM_HERE,
+        base::Bind(callback, cached_plugins));
     return;
   }
 
   if (!loading_plugins_) {
     loading_plugins_ = true;
     callbacks_.push_back(callback);
 
     // When |loading_plugins_| is set to false, this instance must call
     // SetPlugins().
     PluginList::Singleton()->PrepareForPluginLoading();
@@ skipping 175 matching lines @@
 
   DCHECK(next_load_index_ <= canonical_list_.size());
   return next_load_index_ == canonical_list_.size();
 }
 
 void PluginLoaderPosix::FinishedLoadingPlugins() {
   loading_plugins_ = false;
   PluginList::Singleton()->SetPlugins(loaded_plugins_);
 
   for (auto& callback : callbacks_) {
-    base::ThreadTaskRunnerHandle::Get()->PostTask(
+    base::MessageLoop::current()->PostTask(
         FROM_HERE, base::Bind(callback, loaded_plugins_));
   }
   callbacks_.clear();
 }
 
 bool PluginLoaderPosix::LaunchUtilityProcess() {
   return process_host_->Send(new UtilityMsg_LoadPlugins(canonical_list_));
 }
 
 }  // namespace content