Move LanguageState to the translate component

chrome/browser/ui/browser_language_state_observer.h

-// Copyright 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.
-
-#ifndef CHROME_BROWSER_UI_BROWSER_LANGUAGE_STATE_OBSERVER_H_
-#define CHROME_BROWSER_UI_BROWSER_LANGUAGE_STATE_OBSERVER_H_
-
-#include "chrome/browser/tab_contents/language_state_observer.h"
-
-#include "base/basictypes.h"
-#include "base/compiler_specific.h"
-
-class Browser;
-
-// Implementation of LanguageStateObserver for Browser. This observes the state
-// if Translate is enabled or not, and updates toolbar in response to changes in
-// state of translate.
-class BrowserLanguageStateObserver : public LanguageStateObserver {
- public:
-  explicit BrowserLanguageStateObserver(Browser* browser);
-
-  virtual ~BrowserLanguageStateObserver();
-
-  // Overridden from LanguageState::Observer
-  virtual void OnIsPageTranslatedChanged(content::WebContents* source) OVERRIDE;
-  virtual void OnTranslateEnabledChanged(content::WebContents* source) OVERRIDE;
-
- private:
-  Browser* browser_;
-
-  DISALLOW_COPY_AND_ASSIGN(BrowserLanguageStateObserver);
-};
-
-#endif  // CHROME_BROWSER_UI_BROWSER_LANGUAGE_STATE_OBSERVER_H_