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

chrome/app/breakpad_win.cc

Index: chrome/app/breakpad_win.cc
diff --git a/chrome/app/breakpad_win.cc b/chrome/app/breakpad_win.cc
index 06a03931fd8dd9e056985d2ebb1797a5fa4c7dd8..bf0313ffa82ef64fbd680a44e236265c4efb29fc 100644
--- a/chrome/app/breakpad_win.cc
+++ b/chrome/app/breakpad_win.cc
@@ -566,14 +566,14 @@ static bool MetricsReportingControlledByPolicy(bool* result) {
   // TODO(joshia): why hkcu_policy_key opens HKEY_LOCAL_MACHINE?
   base::win::RegKey hkcu_policy_key(HKEY_LOCAL_MACHINE,
                                     policy::kRegistrySubKey, KEY_READ);
-  if (hkcu_policy_key.ReadValueDW(key_name.c_str(), &value) == ERROR_SUCCESS) {
+  if (hkcu_policy_key.ReadValue(key_name.c_str(), &value) == ERROR_SUCCESS) {
     *result = value != 0;
     return true;
   }
 
   base::win::RegKey hklm_policy_key(HKEY_CURRENT_USER,
                                     policy::kRegistrySubKey, KEY_READ);
-  if (hklm_policy_key.ReadValueDW(key_name.c_str(), &value) == ERROR_SUCCESS) {
+  if (hklm_policy_key.ReadValue(key_name.c_str(), &value) == ERROR_SUCCESS) {
     *result = value != 0;
     return true;
   }