Move chromeos code to namespace chromeos.

chrome/browser/chromeos/chromeos_version_loader.h

-// Copyright (c) 2009 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_CHROMEOS_CHROMEOS_VERSION_LOADER_H_
-#define CHROME_BROWSER_CHROMEOS_CHROMEOS_VERSION_LOADER_H_
-
-#include "chrome/browser/cancelable_request.h"
-#include "testing/gtest/include/gtest/gtest_prod.h"
-
-class FilePath;
-
-// ChromeOSVersionLoader loads the version of Chrome OS from the file system.
-// Loading is done asynchronously on the file thread. Once loaded,
-// ChromeOSVersionLoader callsback to a method of your choice with the version
-// (or an empty string if the version couldn't be found).
-// To use ChromeOSVersionLoader do the following:
-//
-// . In your class define a member field of type ChromeOSVersionLoader and
-//   CancelableRequestConsumerBase.
-// . Define the callback method, something like:
-//   void OnGetChromeOSVersion(ChromeOSVersionLoader::Handle,
-//                             std::string version);
-// . When you want the version invoke:  loader.GetVersion(&consumer, callback);
-class ChromeOSVersionLoader : public CancelableRequestProvider {
- public:
-  ChromeOSVersionLoader();
-
-  // Signature
-  typedef Callback2<Handle, std::string>::Type GetVersionCallback;
-
-  typedef CancelableRequest<GetVersionCallback> GetVersionRequest;
-
-  // Asynchronously requests the version.
-  Handle GetVersion(CancelableRequestConsumerBase* consumer,
-                    GetVersionCallback* callback);
-
- private:
-  FRIEND_TEST(ChromeOSVersionLoaderTest, ParseVersion);
-
-  // ChromeOSVersionLoader calls into the Backend on the file thread to load
-  // and extract the version.
-  class Backend : public base::RefCountedThreadSafe<Backend> {
-   public:
-    Backend() {}
-
-    // Calls ParseVersion to get the version # and notifies request.
-    // This is invoked on the file thread.
-    void GetVersion(scoped_refptr<GetVersionRequest> request);
-
-   private:
-    DISALLOW_COPY_AND_ASSIGN(Backend);
-  };
-
-  // Extracts the version from the file.
-  static std::string ParseVersion(const std::string& contents);
-
-  scoped_refptr<Backend> backend_;
-
-  DISALLOW_COPY_AND_ASSIGN(ChromeOSVersionLoader);
-};
-
-#endif  // CHROME_BROWSER_CHROMEOS_CHROMEOS_VERSION_LOADER_H_