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

chrome/installer/util/delete_reg_key_work_item_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 <atlsecurity.h>  // NOLINT
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/win/registry.h"
 #include "chrome/installer/util/delete_reg_key_work_item.h"
@@ skipping 108 matching lines @@
                                     KEY_QUERY_VALUE));
   item->Rollback();
   item.reset();
   EXPECT_EQ(ERROR_SUCCESS, key.Open(test_data_.root_key(), key_name.c_str(),
                                     KEY_QUERY_VALUE));
   std::wstring str_value;
   EXPECT_EQ(ERROR_SUCCESS, key.ReadValue(NULL, &str_value));
   EXPECT_EQ(key_name, str_value);
   EXPECT_EQ(ERROR_SUCCESS, key.OpenKey(L"Subkey", KEY_READ | WRITE_DAC));
   dw_value = 0;
-  EXPECT_EQ(ERROR_SUCCESS, key.ReadValueDW(L"SomeValue", &dw_value));
+  EXPECT_EQ(ERROR_SUCCESS, key.ReadValue(L"SomeValue", &dw_value));
   EXPECT_EQ(1U, dw_value);
   // Give users all access to the subkey so it can be deleted.
   EXPECT_EQ(ERROR_SUCCESS,
       RegSetKeySecurity(key.Handle(), DACL_SECURITY_INFORMATION,
                         const_cast<SECURITY_DESCRIPTOR*>(
                             sec_desc.GetPSECURITY_DESCRIPTOR())));
   EXPECT_EQ(ERROR_SUCCESS, key.OpenKey(L"Subkey2", KEY_QUERY_VALUE));
-  EXPECT_EQ(ERROR_SUCCESS, key.ReadValueDW(L"", &dw_value));
+  EXPECT_EQ(ERROR_SUCCESS, key.ReadValue(L"", &dw_value));
   EXPECT_EQ(2U, dw_value);
 }