Move LanguageState to the translate component

chrome/browser/ui/browser_language_state_observer.cc

-// 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.
-
-#include "chrome/browser/ui/browser_language_state_observer.h"
-
-#include "chrome/browser/tab_contents/language_state.h"
-#include "chrome/browser/translate/translate_tab_helper.h"
-#include "chrome/browser/ui/browser.h"
-#include "chrome/browser/ui/browser_window.h"
-#include "chrome/browser/ui/tabs/tab_strip_model.h"
-
-BrowserLanguageStateObserver::BrowserLanguageStateObserver(Browser* browser)
-    : browser_(browser) {
-}
-
-BrowserLanguageStateObserver::~BrowserLanguageStateObserver() {
-}
-
-void BrowserLanguageStateObserver::OnIsPageTranslatedChanged(
-    content::WebContents* source) {
-  if (source == browser_->tab_strip_model()->GetActiveWebContents()) {
-    TranslateTabHelper* translate_tab_helper =
-        TranslateTabHelper::FromWebContents(source);
-    LanguageState& language_state = translate_tab_helper->language_state();
-    browser_->window()->SetTranslateIconToggled(
-        language_state.IsPageTranslated());
-  }
-}
-
-void BrowserLanguageStateObserver::OnTranslateEnabledChanged(
-    content::WebContents* source) {
-  if (source == browser_->tab_strip_model()->GetActiveWebContents())
-    browser_->window()->UpdateToolbar(source);
-}