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

chrome/installer/util/delete_reg_value_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 "base/file_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/string_util.h"
 #include "base/win/registry.h"
@@ skipping 64 matching lines @@
   EXPECT_FALSE(key.HasValue(name_dword.c_str()));
   EXPECT_FALSE(key.HasValue(name_empty.c_str()));
 
   work_item1->Rollback();
   work_item2->Rollback();
   work_item3->Rollback();
 
   std::wstring read_str;
   DWORD read_dword;
   EXPECT_EQ(ERROR_SUCCESS, key.ReadValue(name_str.c_str(), &read_str));
-  EXPECT_EQ(ERROR_SUCCESS, key.ReadValueDW(name_dword.c_str(), &read_dword));
+  EXPECT_EQ(ERROR_SUCCESS, key.ReadValue(name_dword.c_str(), &read_dword));
   EXPECT_EQ(read_str, data_str);
   EXPECT_EQ(read_dword, data_dword);
 
   // Verify empty value.
   DWORD type = 0;
   DWORD size = 0;
   EXPECT_EQ(ERROR_SUCCESS, key.ReadValue(name_empty.c_str(), NULL, &size,
                                          &type));
   EXPECT_EQ(REG_SZ, type);
   EXPECT_EQ(0, size);
@@ skipping 23 matching lines @@
 
   EXPECT_FALSE(key.HasValue(name_str.c_str()));
   EXPECT_FALSE(key.HasValue(name_dword.c_str()));
 
   work_item1->Rollback();
   work_item2->Rollback();
 
   EXPECT_FALSE(key.HasValue(name_str.c_str()));
   EXPECT_FALSE(key.HasValue(name_dword.c_str()));
 }