Remove old session history logic.

content/renderer/render_view_impl.h

Index: content/renderer/render_view_impl.h
diff --git a/content/renderer/render_view_impl.h b/content/renderer/render_view_impl.h
index 491a00be70e05303cf7c74ae3dfcc3aec5542274..8d42e5680abf5e8323f1b2c5f8b10f4f91e17c83 100644
--- a/content/renderer/render_view_impl.h
+++ b/content/renderer/render_view_impl.h
@@ -95,7 +95,6 @@ class WebHitTestResult;
 
 namespace content {
 
-class HistoryController;
 class RendererDateTimePicker;
 class RenderViewImplTest;
 class RenderViewObserver;
@@ -167,10 +166,6 @@ class CONTENT_EXPORT RenderViewImpl
     send_content_state_immediately_ = value;
   }
 
-  HistoryController* history_controller() {
-    return history_controller_.get();
-  }
-
   // Functions to add and remove observers for this object.
   void AddObserver(RenderViewObserver* observer);
   void RemoveObserver(RenderViewObserver* observer);
@@ -220,9 +215,6 @@ class CONTENT_EXPORT RenderViewImpl
   // be coalesced into one update.
   void StartNavStateSyncTimerIfNecessary(RenderFrameImpl* frame);
 
-  // Synchronously sends the current navigation state to the browser.
-  void SendUpdateState();
-
   // A popup widget opened by this view needs to be shown.
   void ShowCreatedPopupWidget(RenderWidget* popup_widget,
                               blink::WebNavigationPolicy policy,
@@ -792,8 +784,6 @@ class CONTENT_EXPORT RenderViewImpl
   // initialized.
   SpeechRecognitionDispatcher* speech_recognition_dispatcher_;
 
-  std::unique_ptr<HistoryController> history_controller_;
-
 #if defined(OS_ANDROID)
   // Android Specific ---------------------------------------------------------