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

chrome/installer/util/installer_state_unittest.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 <windows.h>
 
 #include <fstream>
 
 #include "base/base_paths.h"
 #include "base/command_line.h"
@@ skipping 477 matching lines @@
     ASSERT_TRUE(temp_handle != NULL);
 
     // The file should now be in use.
     EXPECT_TRUE(MockInstallerState::IsFileInUse(temp_file));
   }
 
   // And once the handle is gone, it should no longer be in use.
   EXPECT_FALSE(MockInstallerState::IsFileInUse(temp_file));
 }
 
+TEST_F(InstallerStateTest, IsNonExistantFileInUse) {
+  base::ScopedTempDir temp_dir;
+  ASSERT_TRUE(temp_dir.CreateUniqueTempDir());
+
+  FilePath temp_file;
+  ASSERT_TRUE(file_util::CreateTemporaryFileInDir(temp_dir.path(), &temp_file));
+  ASSERT_TRUE(file_util::Delete(temp_file, false));
+
+  // There's no file, so it had better not be in use.
+  EXPECT_FALSE(MockInstallerState::IsFileInUse(temp_file));
+}
 
 TEST_F(InstallerStateTest, RemoveOldVersionDirs) {
   MockInstallerState installer_state;
   installer_state.set_target_path(test_dir_.path());
   EXPECT_EQ(test_dir_.path().value(), installer_state.target_path().value());
 
   const char kOldVersion[] = "2.0.0.0";
   const char kNewVersion[] = "3.0.0.0";
   const char kOldChromeExeVersion[] = "2.1.0.0";
   const char kChromeExeVersion[] = "2.1.1.1";
@@ skipping 240 matching lines @@
   // Critical update newer than the new version.
   EXPECT_FALSE(
       installer_state.DetermineCriticalVersion(NULL, *pv_version_).IsValid());
   EXPECT_FALSE(
       installer_state.DetermineCriticalVersion(opv_version_, *pv_version_)
           .IsValid());
   EXPECT_FALSE(
       installer_state.DetermineCriticalVersion(pv_version_, *pv_version_)
           .IsValid());
 }