When page translation state is updated, just ask the toolbar to update, don't

chrome/browser/ui/browser_content_translate_driver_observer.cc

-// Copyright 2014 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_content_translate_driver_observer.h"
-
-#include "chrome/browser/translate/chrome_translate_client.h"
-#include "chrome/browser/ui/browser.h"
-#include "chrome/browser/ui/browser_window.h"
-#include "chrome/browser/ui/tabs/tab_strip_model.h"
-#include "components/translate/core/browser/language_state.h"
-
-BrowserContentTranslateDriverObserver::BrowserContentTranslateDriverObserver(
-    Browser* browser) : browser_(browser) {
-}
-
-BrowserContentTranslateDriverObserver::
-    ~BrowserContentTranslateDriverObserver() {
-}
-
-void BrowserContentTranslateDriverObserver::OnIsPageTranslatedChanged(
-    content::WebContents* source) {
-  if (source == browser_->tab_strip_model()->GetActiveWebContents()) {
-    ChromeTranslateClient* chrome_translate_client =
-        ChromeTranslateClient::FromWebContents(source);
-    translate::LanguageState& language_state =
-        chrome_translate_client->GetLanguageState();
-    browser_->window()->SetTranslateIconToggled(
-        language_state.IsPageTranslated());
-  }
-}
-
-void BrowserContentTranslateDriverObserver::OnTranslateEnabledChanged(
-    content::WebContents* source) {
-  if (source == browser_->tab_strip_model()->GetActiveWebContents())
-    browser_->window()->UpdateToolbar(source);
-}