Don't rely on the pending NavigationEntry for location.replace.

content/common/frame_messages.h

 // 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.
 
 // IPC messages for interacting with frames.
 // Multiply-included message file, hence no include guard.
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 203 matching lines @@
 
   // This is the value from the browser (copied from the navigation request)
   // indicating whether it intended to make a new entry. TODO(avi): Remove this
   // when the pending entry situation is made sane and the browser keeps them
   // around long enough to match them via nav_entry_id.
   IPC_STRUCT_MEMBER(bool, intended_as_new_entry)
 
   // Whether this commit created a new entry.
   IPC_STRUCT_MEMBER(bool, did_create_new_entry)
 
+  // Whether this commit should replace the current entry.
+  IPC_STRUCT_MEMBER(bool, should_replace_current_entry)
+
   // Information regarding the security of the connection (empty if the
   // connection was not secure).
   IPC_STRUCT_MEMBER(std::string, security_info)
 
   // The gesture that initiated this navigation.
   IPC_STRUCT_MEMBER(content::NavigationGesture, gesture)
 
   // True if this was a post request.
   IPC_STRUCT_MEMBER(bool, is_post)
 
@@ skipping 1195 matching lines @@
 IPC_MESSAGE_ROUTED3(FrameHostMsg_FindMatchRects_Reply,
                     int /* version */,
                     std::vector<gfx::RectF> /* rects */,
                     gfx::RectF /* active_rect */)
 #endif
 
 // Adding a new message? Stick to the sort order above: first platform
 // independent FrameMsg, then ifdefs for platform specific FrameMsg, then
 // platform independent FrameHostMsg, then ifdefs for platform specific
 // FrameHostMsg.