Revert 63600 - Thread IO safety: annotate file_util, and block IO thread from...

chrome/browser/net/url_request_mock_util.cc

Index: chrome/browser/net/url_request_mock_util.cc
===================================================================
--- chrome/browser/net/url_request_mock_util.cc	(revision 63629)
+++ chrome/browser/net/url_request_mock_util.cc	(working copy)
@@ -7,7 +7,6 @@
 #include <string>
 
 #include "base/path_service.h"
-#include "base/thread_restrictions.h"
 #include "chrome/browser/browser_thread.h"
 #include "chrome/browser/net/url_request_failed_dns_job.h"
 #include "chrome/browser/net/url_request_mock_http_job.h"
@@ -25,11 +24,6 @@
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 
   if (enabled) {
-    // We have to look around for our helper files, but we only use
-    // this from tests, so allow these IO operations to happen
-    // anywhere.
-    base::ThreadRestrictions::ScopedAllowIO allow_io;
-
     URLRequestFilter::GetInstance()->ClearHandlers();
 
     URLRequestFailedDnsJob::AddUrlHandler();