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

chrome/installer/util/google_update_settings.cc

Index: chrome/installer/util/google_update_settings.cc
diff --git a/chrome/installer/util/google_update_settings.cc b/chrome/installer/util/google_update_settings.cc
index babd396e6909a6a32ddc62505da6e1a723644525..8f8e296f6cb8a77b1674cd5777063ee48d05520b 100644
--- a/chrome/installer/util/google_update_settings.cc
+++ b/chrome/installer/util/google_update_settings.cc
@@ -113,8 +113,8 @@ EulaSearchResult HasEULASetting(HKEY root, const std::wstring& state_key,
   DWORD previous_value = setting ? 1 : 0;
   if (key.Open(root, state_key.c_str(), KEY_QUERY_VALUE) != ERROR_SUCCESS)
     return NO_SETTING;
-  if (key.ReadValueDW(google_update::kRegEULAAceptedField,
-                      &previous_value) != ERROR_SUCCESS)
+  if (key.ReadValue(google_update::kRegEULAAceptedField,
+                    &previous_value) != ERROR_SUCCESS)
     return FOUND_CLIENT_STATE;
 
   return ((previous_value != 0) == setting) ?
@@ -206,16 +206,16 @@ bool GoogleUpdateSettings::GetCollectStatsConsent() {
       system_install &&
       key.Open(HKEY_LOCAL_MACHINE, dist->GetStateMediumKey().c_str(),
                KEY_QUERY_VALUE) == ERROR_SUCCESS &&
-      key.ReadValueDW(google_update::kRegUsageStatsField,
-                      &value) == ERROR_SUCCESS;
+      key.ReadValue(google_update::kRegUsageStatsField,
+                    &value) == ERROR_SUCCESS;
 
   // Otherwise, try ClientState.
   have_value =
       !have_value &&
       key.Open(system_install ? HKEY_LOCAL_MACHINE : HKEY_CURRENT_USER,
                dist->GetStateKey().c_str(), KEY_QUERY_VALUE) == ERROR_SUCCESS &&
-      key.ReadValueDW(google_update::kRegUsageStatsField,
-                      &value) == ERROR_SUCCESS;
+      key.ReadValue(google_update::kRegUsageStatsField,
+                    &value) == ERROR_SUCCESS;
 
   // Google Update specifically checks that the value is 1, so we do the same.
   return have_value && value == 1;
@@ -508,14 +508,14 @@ GoogleUpdateSettings::UpdatePolicy GoogleUpdateSettings::GetAppUpdatePolicy(
                                kPrefixLen);
     app_update_override.append(app_guid);
     // First try to read and comprehend the app-specific override.
-    found_override = (policy_key.ReadValueDW(app_update_override.c_str(),
-                                             &value) == ERROR_SUCCESS &&
+    found_override = (policy_key.ReadValue(app_update_override.c_str(),
+                                           &value) == ERROR_SUCCESS &&
                       GetUpdatePolicyFromDword(value, &update_policy));
 
     // Failing that, try to read and comprehend the default override.
     if (!found_override &&
-        policy_key.ReadValueDW(kGoogleUpdateUpdatePolicyValue,
-                               &value) == ERROR_SUCCESS) {
+        policy_key.ReadValue(kGoogleUpdateUpdatePolicyValue,
+                             &value) == ERROR_SUCCESS) {
       GetUpdatePolicyFromDword(value, &update_policy);
     }
   }