Revert of [Prerender] Restore request priorities when swapped in

chrome/browser/prerender/prerender_nostate_prefetch_browsertest.cc

Index: chrome/browser/prerender/prerender_nostate_prefetch_browsertest.cc
diff --git a/chrome/browser/prerender/prerender_nostate_prefetch_browsertest.cc b/chrome/browser/prerender/prerender_nostate_prefetch_browsertest.cc
index 0f4c75711fa1edda3b76971d6f8e2f246844cb74..65551c02de58d59c99c39ad334468b006e804518 100644
--- a/chrome/browser/prerender/prerender_nostate_prefetch_browsertest.cc
+++ b/chrome/browser/prerender/prerender_nostate_prefetch_browsertest.cc
@@ -284,8 +284,10 @@
   base::FilePath first_path = ui_test_utils::GetTestFilePath(
       base::FilePath(), base::FilePath().AppendASCII(kPrefetchPage));
 
-  test_utils::CreateHangingFirstRequestInterceptor(
-      first_url, first_path, base::Callback<void(net::URLRequest*)>());
+  content::BrowserThread::PostTask(
+      content::BrowserThread::IO, FROM_HERE,
+      base::Bind(&test_utils::CreateHangingFirstRequestInterceptorOnIO,
+                 first_url, first_path, base::Closure()));
 
   // Start the first prefetch directly instead of via PrefetchFromFile for the
   // first prefetch to avoid the wait on prerender stop.