Use loading task queue in RendererPpapiHost

content/renderer/pepper/renderer_ppapi_host_impl.cc

Index: content/renderer/pepper/renderer_ppapi_host_impl.cc
diff --git a/content/renderer/pepper/renderer_ppapi_host_impl.cc b/content/renderer/pepper/renderer_ppapi_host_impl.cc
index 32bf18f46d4756c202029adbe1d56ca29e360584..40b2877cabd11258bfd4a905a251f24957c1780e 100644
--- a/content/renderer/pepper/renderer_ppapi_host_impl.cc
+++ b/content/renderer/pepper/renderer_ppapi_host_impl.cc
@@ -262,7 +262,7 @@ void RendererPpapiHostImpl::CreateBrowserResourceHosts(
   PepperBrowserConnection* browser_connection =
       PepperBrowserConnection::Get(render_frame);
   if (!browser_connection) {
-    base::ThreadTaskRunnerHandle::Get()->PostTask(
+    render_frame->GetLoadingTaskRunner()->PostTask(

[alex clarke (OOO till 29th), 2017/01/23 11:37:05]

So in theory I think that's a reasonable change. The tricky bit (and where I
don't know enough about PPAPI to be sure) is there might be some ordering
dependencies.

E.g. perhaps some of these need to change as well:

https://cs.chromium.org/search/?q=PostTask+f:renderer+f:pepper&sq=package:chr...

You might just have to try this and see.  It's a simple change so a revert if
needed is easy.

         FROM_HERE,
         base::Bind(callback, std::vector<int>(nested_msgs.size(), 0)));
   } else {