[SystemInfo API] Finish TODOs in SystemInfoProvider

chrome/browser/extensions/api/system_info_cpu/cpu_info_provider.h

 // 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.
 #ifndef CHROME_BROWSER_EXTENSIONS_API_SYSTEM_INFO_CPU_CPU_INFO_PROVIDER_H_
 #define CHROME_BROWSER_EXTENSIONS_API_SYSTEM_INFO_CPU_CPU_INFO_PROVIDER_H_
 
 #include <vector>
 
 #include "base/timer/timer.h"
 #include "chrome/browser/extensions/api/system_info/system_info_provider.h"
 #include "chrome/common/extensions/api/system_info_cpu.h"
 
 namespace extensions {
 
 class CpuInfoProvider
     : public SystemInfoProvider<api::system_info_cpu::CpuInfo> {
  public:
   // Overriden from SystemInfoProvider<CpuInfo>.
-  virtual bool QueryInfo(
-      api::system_info_cpu::CpuInfo* info) OVERRIDE;
+  virtual bool QueryInfo() OVERRIDE;
 
   // Return the single shared instance of CpuInfoProvider.
   static CpuInfoProvider* Get();
 
+  const api::system_info_cpu::CpuInfo& cpu_info() const;
+
  private:
   friend class SystemInfoProvider<api::system_info_cpu::CpuInfo>;
   friend class MockCpuInfoProviderImpl;
   friend class TestCpuInfoProvider;
 
   CpuInfoProvider();
 
   virtual ~CpuInfoProvider();
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_SYSTEM_INFO_CPU_CPU_INFO_PROVIDER_H_