Reduce/remove usage of BrowserThread in content/browser/loader.

content/browser/loader/loader_io_thread_notifier.cc

Index: content/browser/loader/loader_io_thread_notifier.cc
diff --git a/content/browser/loader/loader_io_thread_notifier.cc b/content/browser/loader/loader_io_thread_notifier.cc
index a10537c9d3d342714e9245ce6628915cf3343176..9ae1111c3565fd232b3da6c17082fd73c785a43b 100644
--- a/content/browser/loader/loader_io_thread_notifier.cc
+++ b/content/browser/loader/loader_io_thread_notifier.cc
@@ -6,8 +6,8 @@
 
 #include "content/browser/frame_host/render_frame_host_impl.h"
 #include "content/browser/loader/global_routing_id.h"
+#include "content/browser/loader/loader_globals.h"
 #include "content/browser/loader/resource_dispatcher_host_impl.h"
-#include "content/public/browser/browser_thread.h"
 
 namespace content {
 
@@ -28,11 +28,10 @@ LoaderIOThreadNotifier::~LoaderIOThreadNotifier() {}
 
 void LoaderIOThreadNotifier::RenderFrameDeleted(
     RenderFrameHost* render_frame_host) {
-  BrowserThread::PostTask(
-      BrowserThread::IO, FROM_HERE,
-      base::Bind(&NotifyRenderFrameDeletedOnIO,
-                 static_cast<RenderFrameHostImpl*>(render_frame_host)
-                     ->GetGlobalFrameRoutingId()));
+  LoaderGlobals::Get()->io_thread_task_runner()->PostTask(
+      FROM_HERE, base::Bind(&NotifyRenderFrameDeletedOnIO,
+                            static_cast<RenderFrameHostImpl*>(render_frame_host)
+                                ->GetGlobalFrameRoutingId()));
 }
 
 }  // namespace content