Move LanguageState to the translate component

components/translate/content/browser/content_translate_driver.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 "components/translate/content/browser/content_translate_driver.h"
+
+#include "base/logging.h"
+#include "components/translate/content/browser/language_state_observer.h"
+#include "content/public/browser/navigation_controller.h"
+#include "content/public/browser/navigation_details.h"
+#include "content/public/browser/navigation_entry.h"
+
+ContentTranslateDriver::ContentTranslateDriver(
+    content::NavigationController* nav_controller)
+    : navigation_controller_(nav_controller),
+      language_state_(this),
+      language_state_observer_(NULL) {
+  DCHECK(navigation_controller_);
+}
+
+ContentTranslateDriver::~ContentTranslateDriver() {}
+
+LanguageState& ContentTranslateDriver::GetLanguageState() {
+  return language_state_;
+}
+
+void ContentTranslateDriver::SetLanguageStateObserver(
+    LanguageStateObserver* observer) {
+  language_state_observer_ = observer;

[MAD, 2014/01/20 16:12:25]

Since this is just a simple mutator, it could also be inlined and use
hacker_style_name() with a set_ prefix.

+}
+
+void ContentTranslateDriver::DidNavigate(
+    const content::LoadCommittedDetails& details) {
+  const bool reload =
+      details.entry->GetTransitionType() == content::PAGE_TRANSITION_RELOAD ||
+      details.type == content::NAVIGATION_TYPE_SAME_PAGE;
+  language_state_.DidNavigate(
+      details.is_in_page, details.is_main_frame, reload);
+}
+
+// TranslateDriver methods
+
+bool ContentTranslateDriver::IsLinkNavigation() {
+  return navigation_controller_ && navigation_controller_->GetActiveEntry() &&
+         navigation_controller_->GetActiveEntry()->GetTransitionType() ==
+             content::PAGE_TRANSITION_LINK;
+}
+
+void ContentTranslateDriver::OnTranslateEnabledChanged() {
+  if (language_state_observer_) {
+    content::WebContents* web_contents =
+        navigation_controller_->GetWebContents();
+    language_state_observer_->OnTranslateEnabledChanged(web_contents);
+  }
+}
+
+void ContentTranslateDriver::OnIsPageTranslatedChanged() {
+  if (language_state_observer_) {
+    content::WebContents* web_contents =
+        navigation_controller_->GetWebContents();
+    language_state_observer_->OnIsPageTranslatedChanged(web_contents);
+  }
+}