Turn on file access checks on Win.

chrome/browser/download/save_package.cc

 // Copyright (c) 2010 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 "chrome/browser/download/save_package.h"
 
 #include "app/l10n_util.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/i18n/file_util_icu.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/stl_util-inl.h"
 #include "base/string_piece.h"
 #include "base/string_split.h"
+#include "base/thread_restrictions.h"
 #include "base/utf_string_conversions.h"
 #include "base/task.h"
 #include "base/thread.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/browser_thread.h"
 #include "chrome/browser/download/download_item.h"
 #include "chrome/browser/download/download_item_model.h"
 #include "chrome/browser/download/download_manager.h"
 #include "chrome/browser/download/download_shelf.h"
 #include "chrome/browser/download/download_util.h"
@@ skipping 1125 matching lines @@
   // Adjust extension for complete types.
   if (can_save_as_complete)
     name_with_proper_ext = EnsureHtmlExtension(name_with_proper_ext);
 
   FilePath::StringType file_name = name_with_proper_ext.value();
   file_util::ReplaceIllegalCharactersInPath(&file_name, ' ');
   return FilePath(file_name);
 }
 
 FilePath SavePackage::EnsureHtmlExtension(const FilePath& name) {
+  // The GetMimeTypeFromExtension call will end up going to disk.  Do this on
+  // another thread to avoid slowing the UI thread.  http://crbug.com/61775
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
+
   // If the file name doesn't have an extension suitable for HTML files,
   // append one.
   FilePath::StringType ext = name.Extension();
   if (!ext.empty())
     ext.erase(ext.begin());  // Erase preceding '.'.
   std::string mime_type;
   if (!net::GetMimeTypeFromExtension(ext, &mime_type) ||
       !CanSaveAsComplete(mime_type)) {
     return FilePath(name.value() + FILE_PATH_LITERAL(".") +
                     kDefaultHtmlExtension);
   }
   return name;
 }
 
 FilePath SavePackage::EnsureMimeExtension(const FilePath& name,
     const FilePath::StringType& contents_mime_type) {
+  // The GetMimeTypeFromExtension call will end up going to disk.  Do this on
+  // another thread to avoid slowing the UI thread.  http://crbug.com/61775
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
+
   // Start extension at 1 to skip over period if non-empty.
   FilePath::StringType ext = name.Extension().length() ?
       name.Extension().substr(1) : name.Extension();
   FilePath::StringType suggested_extension =
       ExtensionForMimeType(contents_mime_type);
   std::string mime_type;
   if (!suggested_extension.empty() &&
       (!net::GetMimeTypeFromExtension(ext, &mime_type) ||
       !IsSavableContents(mime_type))) {
     // Extension is absent or needs to be updated.
@@ skipping 208 matching lines @@
                                int index, void* params) {
   SavePackageParam* save_params = reinterpret_cast<SavePackageParam*>(params);
   ContinueSave(save_params, path, index);
   delete save_params;
 }
 
 void SavePackage::FileSelectionCanceled(void* params) {
   SavePackageParam* save_params = reinterpret_cast<SavePackageParam*>(params);
   delete save_params;
 }