[SystemInfo API] Finish TODOs in SystemInfoProvider

chrome/browser/extensions/api/system_info_display/display_info_provider_win.cc

 // Copyright (c) 2012 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 "chrome/browser/extensions/api/system_info_display/display_info_provider.h"
 
 #include <windows.h>
 
 #include "base/strings/utf_string_conversions.h"
 #include "ui/base/win/dpi.h"
@@ skipping 63 matching lines @@
 
 void DisplayInfoProvider::SetInfo(
     const std::string& display_id,
     const api::system_info_display::DisplayProperties& info,
     const SetInfoCallback& callback) {
   base::MessageLoopProxy::current()->PostTask(
       FROM_HERE,
       base::Bind(callback, false, "Not implemented"));
 }
 
-bool DisplayInfoProvider::QueryInfo(DisplayInfo* info) {
-  DCHECK(info);
-  info->clear();
+bool DisplayInfoProvider::QueryInfo() {
+  info_.clear();
 
   if (EnumDisplayMonitors(NULL, NULL, EnumMonitorCallback,
-        reinterpret_cast<LPARAM>(info)))
+        reinterpret_cast<LPARAM>(&info_)))
     return true;
   return false;
 }
 
 }  // namespace extensions