base/win: Add documentation to RegKey::Read/Write functions.

chrome/installer/util/installer_state_unittest.cc

 // Copyright (c) 2011 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 378 matching lines @@
     InstallerState state;
     state.Initialize(cmd_line, prefs, machine_state);
     state.WriteInstallerResult(installer::FIRST_INSTALL_SUCCESS,
                                IDS_INSTALL_OS_ERROR_BASE, &launch_cmd);
     BrowserDistribution* distribution =
         BrowserDistribution::GetSpecificDistribution(
             BrowserDistribution::CHROME_BROWSER);
     EXPECT_EQ(ERROR_SUCCESS,
         key.Open(root, distribution->GetStateKey().c_str(), KEY_READ));
     EXPECT_EQ(ERROR_SUCCESS,
-        key.ReadValueDW(installer::kInstallerResult, &dw_value));
+        key.ReadValue(installer::kInstallerResult, &dw_value));
     EXPECT_EQ(static_cast<DWORD>(0), dw_value);
     EXPECT_EQ(ERROR_SUCCESS,
-        key.ReadValueDW(installer::kInstallerError, &dw_value));
+        key.ReadValue(installer::kInstallerError, &dw_value));
     EXPECT_EQ(static_cast<DWORD>(installer::FIRST_INSTALL_SUCCESS), dw_value);
     EXPECT_EQ(ERROR_SUCCESS,
         key.ReadValue(installer::kInstallerResultUIString, &value));
     EXPECT_FALSE(value.empty());
     EXPECT_EQ(ERROR_SUCCESS,
         key.ReadValue(installer::kInstallerSuccessLaunchCmdLine, &value));
     EXPECT_EQ(launch_cmd, value);
   }
 
   // check results for a fresh install of multi Chrome
@@ skipping 71 matching lines @@
                    NULL, OPEN_EXISTING, 0, 0));
     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));
 }