content/child: Remove use of MessageLoopProxy and deprecated MessageLoop APIs

content/renderer/npapi/webplugin_delegate_proxy.cc

Index: content/renderer/npapi/webplugin_delegate_proxy.cc
diff --git a/content/renderer/npapi/webplugin_delegate_proxy.cc b/content/renderer/npapi/webplugin_delegate_proxy.cc
index 8e83b86942425787225ef31806dc1242e412ed8c..e5566bce6e0495c1f939c5684fbb9c706e522894 100644
--- a/content/renderer/npapi/webplugin_delegate_proxy.cc
+++ b/content/renderer/npapi/webplugin_delegate_proxy.cc
@@ -321,9 +321,8 @@ bool WebPluginDelegateProxy::Initialize(
       return false;
     }
 
-    channel_host =
-        PluginChannelHost::GetPluginChannelHost(
-            channel_handle, ChildProcess::current()->io_message_loop_proxy());
+    channel_host = PluginChannelHost::GetPluginChannelHost(
+        channel_handle, ChildProcess::current()->io_task_runner());
     if (!channel_host.get()) {
       LOG(ERROR) << "Couldn't get PluginChannelHost";
       continue;