Change IsSwappedOut to const and do a more restrictive check.

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index f9f96887cb0798e0aa75af8fb933272d14add789..5d2c678111608b54c559edfa723316d3972c28ab 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -2745,7 +2745,7 @@ void WebContentsImpl::UpdateState(RenderViewHost* rvh,
                                   const std::string& state) {
   // Ensure that this state update comes from either the active RVH or one of
   // the swapped out RVHs.  We don't expect to hear from any other RVHs.
-  DCHECK(rvh == GetRenderViewHost() || render_manager_.IsSwappedOut(rvh));
+  DCHECK(rvh == GetRenderViewHost() || render_manager_.IsOnSwappedOutList(rvh));
 
   // We must be prepared to handle state updates for any page, these occur
   // when the user is scrolling and entering form data, as well as when we're