Remove page id from title and state updating.

content/common/swapped_out_messages.cc

Index: content/common/swapped_out_messages.cc
diff --git a/content/common/swapped_out_messages.cc b/content/common/swapped_out_messages.cc
index 39ba68fff3722ded1a3f8878cdfe4b666cb91d4e..34ce47ba9a73da8d55b63ab3e8b761853eec8a47 100644
--- a/content/common/swapped_out_messages.cc
+++ b/content/common/swapped_out_messages.cc
@@ -43,9 +43,6 @@ bool SwappedOutMessages::CanSendWhileSwappedOut(const IPC::Message* msg) {
     case FrameHostMsg_DomOperationResponse::ID:
     // Input events propagate from parent to child.
     case FrameHostMsg_ForwardInputEvent::ID:
-    // The browser should always have an accurate mirror of the renderer's
-    // notion of the current page id.
-    case FrameHostMsg_DidAssignPageId::ID:
     // A swapped-out frame's opener might be updated with window.open.
     case FrameHostMsg_DidChangeOpener::ID:
     // For handling pop-ups from cross-site frames.