Remove the extra copy of page id.

content/browser/frame_host/render_frame_host_impl.cc

Index: content/browser/frame_host/render_frame_host_impl.cc
diff --git a/content/browser/frame_host/render_frame_host_impl.cc b/content/browser/frame_host/render_frame_host_impl.cc
index f1f94548605c19e3cebb12107694f5360c710a31..da6327d16682da46164e9f8840f825121256e320 100644
--- a/content/browser/frame_host/render_frame_host_impl.cc
+++ b/content/browser/frame_host/render_frame_host_impl.cc
@@ -395,7 +395,6 @@ bool RenderFrameHostImpl::OnMessageReceived(const IPC::Message &msg) {
                         OnDidAccessInitialDocument)
     IPC_MESSAGE_HANDLER(FrameHostMsg_DidDisownOpener, OnDidDisownOpener)
     IPC_MESSAGE_HANDLER(FrameHostMsg_DidChangeName, OnDidChangeName)
-    IPC_MESSAGE_HANDLER(FrameHostMsg_DidAssignPageId, OnDidAssignPageId)
     IPC_MESSAGE_HANDLER(FrameHostMsg_DidChangeSandboxFlags,
                         OnDidChangeSandboxFlags)
     IPC_MESSAGE_HANDLER(FrameHostMsg_UpdateTitle, OnUpdateTitle)
@@ -1245,12 +1244,6 @@ void RenderFrameHostImpl::OnDidChangeName(const std::string& name) {
   delegate_->DidChangeName(this, name);
 }
 
-void RenderFrameHostImpl::OnDidAssignPageId(int32 page_id) {
-  // Update the RVH's current page ID so that future IPCs from the renderer
-  // correspond to the new page.
-  render_view_host_->page_id_ = page_id;
-}
-
 void RenderFrameHostImpl::OnDidChangeSandboxFlags(int32 frame_routing_id,
                                                   SandboxFlags flags) {
   FrameTree* frame_tree = frame_tree_node()->frame_tree();