Remove old session history logic.

content/common/swapped_out_messages.cc

 // Copyright (c) 2012 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 "content/common/swapped_out_messages.h"
 
 #include "content/common/accessibility_messages.h"
 #include "content/common/frame_messages.h"
 #include "content/common/input_messages.h"
 #include "content/common/view_messages.h"
@@ skipping 40 matching lines @@
   // be handled by the browser.
   if (CanSendWhileSwappedOut(&msg))
     return true;
 
   // We drop most other messages that arrive from a swapped out renderer.
   // However, some are important (e.g., ACKs) for keeping the browser and
   // renderer state consistent in case we later return to the renderer.
   // Note that synchronous messages that are not handled will receive an
   // error reply instead, to avoid leaving the renderer in a stuck state.
   switch (msg.type()) {
-    // Updates the previous navigation entry.
-    case ViewHostMsg_UpdateState::ID:
     // Sends an ACK.
     case ViewHostMsg_UpdateTargetURL::ID:
     // We allow closing even if we are in the process of swapping out.
     case ViewHostMsg_Close::ID:
     // Sends an ACK.
     case ViewHostMsg_RequestMove::ID:
     // Sends an ACK.
     case AccessibilityHostMsg_Events::ID:
       return true;
     default:
       break;
   }
 
   return false;
 }
 
 }  // namespace content