Remove the default argument from RegKey::ReadValue.

chrome/browser/policy/configuration_policy_provider_win.cc

Index: chrome/browser/policy/configuration_policy_provider_win.cc
diff --git a/chrome/browser/policy/configuration_policy_provider_win.cc b/chrome/browser/policy/configuration_policy_provider_win.cc
index 713008352e30b42a627a0b96428f0fd485574619..284ca9d960356e9d44d37f090108c87adf24ede8 100644
--- a/chrome/browser/policy/configuration_policy_provider_win.cc
+++ b/chrome/browser/policy/configuration_policy_provider_win.cc
@@ -172,7 +172,7 @@ bool ConfigurationPolicyProviderWin::ReadRegistryStringValue(
   // the 0-termination.
   buffer.reset(new uint8[value_size + 2]);
   memset(buffer.get(), 0, value_size + 2);
-  key->ReadValue(name.c_str(), buffer.get(), &value_size);
+  key->ReadValue(name.c_str(), buffer.get(), &value_size, NULL);
   result->assign(reinterpret_cast<const wchar_t*>(buffer.get()));
   return true;
 }