More aggressive IO asserts in content_browsertests.

net/test/test_data_directory.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/test/test_data_directory.h"
 
 #include "base/base_paths.h"
 #include "base/path_service.h"
+#include "base/threading/thread_restrictions.h"
 
 namespace net {
 
 namespace {
 const base::FilePath::CharType kCertificateRelativePath[] =
     FILE_PATH_LITERAL("net/data/ssl/certificates");
 }  // namespace
 
 base::FilePath GetTestCertsDirectory() {
   base::FilePath src_root;
-  PathService::Get(base::DIR_SOURCE_ROOT, &src_root);
+  {
+    base::ThreadRestrictions::ScopedAllowIO allow_io_for_path_service;
+    PathService::Get(base::DIR_SOURCE_ROOT, &src_root);
+  }
+
   return src_root.Append(kCertificateRelativePath);
 }
 
 base::FilePath GetTestClientCertsDirectory() {
 #if defined(OS_ANDROID)
   return base::FilePath(kCertificateRelativePath);
 #else
   return GetTestCertsDirectory();
 #endif
 }
 
 base::FilePath GetWebSocketTestDataDirectory() {
   base::FilePath data_dir(FILE_PATH_LITERAL("net/data/websocket"));
   return data_dir;
 }
 
 }  // namespace net