[SystemInfo API] Finish TODOs in SystemInfoProvider

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

 // Copyright (c) 2013 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 "ash/display/display_controller.h"
 #include "ash/display/display_manager.h"
 #include "ash/shell.h"
 #include "base/message_loop/message_loop_proxy.h"
@@ skipping 393 matching lines @@
     UpdateDisplayLayout(primary.bounds(), primary.id(),
                         target_bounds, target.id());
   }
 
   return true;
 }
 
 }  // namespace
 
 void DisplayInfoProvider::RequestInfo(const RequestInfoCallback& callback) {
-  DisplayInfo requested_info;
-  bool success = QueryInfo(&requested_info);
+  bool success = QueryInfo();
 
   base::MessageLoopProxy::current()->PostTask(
       FROM_HERE,
-      base::Bind(callback, requested_info, success));
+      base::Bind(callback, success));
 }
 
 void DisplayInfoProvider::SetInfo(const std::string& display_id,
                                   const DisplayProperties& info,
                                   const SetInfoCallback& callback) {
   std::string error;
   bool success = SetInfoImpl(display_id, info, &error);
   base::MessageLoopProxy::current()->PostTask(
       FROM_HERE,
       base::Bind(callback, success, error));
 }
 
-bool DisplayInfoProvider::QueryInfo(DisplayInfo* info) {
-  DCHECK(info);
-  info->clear();
+bool DisplayInfoProvider::QueryInfo() {
+  info_.clear();
 
   DisplayManager* display_manager =
       ash::Shell::GetInstance()->display_manager();
   DCHECK(display_manager);
 
   int64 primary_id = ash::Shell::GetScreen()->GetPrimaryDisplay().id();
   for (size_t i = 0; i < display_manager->GetNumDisplays(); ++i) {
     AddInfoForDisplay(*display_manager->GetDisplayAt(i), display_manager,
-                      primary_id, info);
+                      primary_id, &info_);
   }
 
   return true;
 }
 
 }  // namespace extensions