IsFileInUse should return false when the file doesn't exist.

chrome/installer/util/installer_state.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 "chrome/installer/util/installer_state.h"
 
 #include <algorithm>
 #include <functional>
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/file_util.h"
 #include "base/file_version_info.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "base/win/registry.h"
-#include "base/win/scoped_handle.h"
 #include "chrome/installer/util/delete_tree_work_item.h"
 #include "chrome/installer/util/helper.h"
 #include "chrome/installer/util/install_util.h"
 #include "chrome/installer/util/installation_state.h"
 #include "chrome/installer/util/master_preferences.h"
 #include "chrome/installer/util/master_preferences_constants.h"
 #include "chrome/installer/util/product.h"
 #include "chrome/installer/util/work_item.h"
 #include "chrome/installer/util/work_item_list.h"
 
@@ skipping 545 matching lines @@
 
 FilePath InstallerState::GetInstallerDirectory(const Version& version) const {
   return target_path().Append(ASCIIToWide(version.GetString()))
       .Append(kInstallerDir);
 }
 
 // static
 bool InstallerState::IsFileInUse(const FilePath& file) {
   // Call CreateFile with a share mode of 0 which should cause this to fail
   // with ERROR_SHARING_VIOLATION if the file exists and is in-use.
-  return !base::win::ScopedHandle(CreateFile(file.value().c_str(),
-                                             GENERIC_WRITE, 0, NULL,
-                                             OPEN_EXISTING, 0, 0)).IsValid();
+  HANDLE file_handle = CreateFile(file.value().c_str(), GENERIC_WRITE, 0, NULL,
+                                  OPEN_EXISTING, 0, 0);
+  bool in_use = false;
+  if (file_handle != INVALID_HANDLE_VALUE)
+    CloseHandle(file_handle);
+  else if (GetLastError() != ERROR_FILE_NOT_FOUND)
+    in_use = true;
+  return in_use;
 }
 
 
 void InstallerState::GetExistingExeVersions(
     std::set<std::string>* existing_versions) const {
 
   static const wchar_t* const kChromeFilenames[] = {
     installer::kChromeExe,
     installer::kChromeNewExe,
     installer::kChromeOldExe,
@@ skipping 165 matching lines @@
   if (is_multi_install()) {
     InstallUtil::AddInstallerResultItems(
         system_install, multi_package_binaries_distribution()->GetStateKey(),
         status, string_resource_id, launch_cmd, install_list.get());
   }
   if (!install_list->Do())
     LOG(ERROR) << "Failed to record installer error information in registry.";
 }
 
 }  // namespace installer