Crash earlier if a session restore entry doesn't have content state.

content/renderer/render_view_impl.cc

Index: content/renderer/render_view_impl.cc
diff --git a/content/renderer/render_view_impl.cc b/content/renderer/render_view_impl.cc
index 578eb5ee30171aa8894638deb157e7759b6acda9..82e910f7dd5f9ea163762c5913fab2db0886473f 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -776,7 +776,7 @@ void RenderViewImpl::OnNavigate(const ViewMsg_Navigate_Params& params) {
     WebURLRequest request(params.url);
 
     // A session history navigation should have been accompanied by state.
-    DCHECK_EQ(params.page_id, -1);
+    CHECK_EQ(params.page_id, -1);
 
     if (main_frame->isViewSourceModeEnabled())
       request.setCachePolicy(WebURLRequest::ReturnCacheDataElseLoad);