Remove use of deprecated MessageLoop methods in content.

content/renderer/browser_plugin/browser_plugin.cc

 // Copyright 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/renderer/browser_plugin/browser_plugin.h"
 
 #include <stddef.h>
 #include <utility>
 
 #include "base/command_line.h"
@@ skipping 307 matching lines @@
     g_plugin_container_map.Get().erase(container_);
   }
 
   container_ = nullptr;
   // Will be a no-op if the mouse is not currently locked.
   auto render_frame = RenderFrameImpl::FromRoutingID(render_frame_routing_id());
   auto render_view = static_cast<RenderViewImpl*>(
       render_frame ? render_frame->GetRenderView() : nullptr);
   if (render_view)
     render_view->mouse_lock_dispatcher()->OnLockTargetDestroyed(this);
-  base::MessageLoop::current()->DeleteSoon(FROM_HERE, this);
+  base::ThreadTaskRunnerHandle::Get()->DeleteSoon(FROM_HERE, this);
 }
 
 v8::Local<v8::Object> BrowserPlugin::v8ScriptableObject(v8::Isolate* isolate) {
   if (!delegate_)
     return v8::Local<v8::Object>();
 
   return delegate_->V8ScriptableObject(isolate);
 }
 
 bool BrowserPlugin::supportsKeyboardFocus() const {
@@ skipping 230 matching lines @@
 
 bool BrowserPlugin::HandleMouseLockedInputEvent(
     const blink::WebMouseEvent& event) {
   BrowserPluginManager::Get()->Send(
       new BrowserPluginHostMsg_HandleInputEvent(browser_plugin_instance_id_,
                                                 &event));
   return true;
 }
 
 }  // namespace content