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

chrome/browser/policy/configuration_policy_provider_delegate_win.cc

Index: chrome/browser/policy/configuration_policy_provider_delegate_win.cc
diff --git a/chrome/browser/policy/configuration_policy_provider_delegate_win.cc b/chrome/browser/policy/configuration_policy_provider_delegate_win.cc
index a7f47cb2459eaf46ff8bc4f820d7d7a01755817e..959f5c3261f5c8e5749638c6ea5ac08ff081c778 100644
--- a/chrome/browser/policy/configuration_policy_provider_delegate_win.cc
+++ b/chrome/browser/policy/configuration_policy_provider_delegate_win.cc
@@ -140,14 +140,14 @@ bool ConfigurationPolicyProviderDelegateWin::GetRegistryPolicyInteger(
     const string16& value_name, uint32* result) const {
   DWORD value = 0;
   RegKey policy_key(HKEY_LOCAL_MACHINE, kRegistrySubKey, KEY_READ);
-  if (policy_key.ReadValueDW(value_name.c_str(), &value) == ERROR_SUCCESS) {
+  if (policy_key.ReadValue(value_name.c_str(), &value) == ERROR_SUCCESS) {
     *result = value;
     return true;
   }
 
   if (policy_key.Open(HKEY_CURRENT_USER, kRegistrySubKey, KEY_READ) ==
       ERROR_SUCCESS) {
-    if (policy_key.ReadValueDW(value_name.c_str(), &value) == ERROR_SUCCESS) {
+    if (policy_key.ReadValue(value_name.c_str(), &value) == ERROR_SUCCESS) {
       *result = value;
       return true;
     }