Workaround for reading bad PageState from session history.

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 370bd2f436bcc2618698e033425cc6cbc59a6695..5ff154497bfe76d44647a4de419b321486a42385 100644
--- a/content/browser/frame_host/render_frame_host_impl.cc
+++ b/content/browser/frame_host/render_frame_host_impl.cc
@@ -972,6 +972,13 @@ void RenderFrameHostImpl::OnOpenURL(const FrameHostMsg_OpenURL_Params& params) {
     if (frame_tree_node_->navigator()->NavigateNewChildFrame(
             this, params.frame_unique_name))
       return;
+
+    // No need to explicitly load about:blank, since we start there anyway.
+    if (params.url == GURL(url::kAboutBlankURL)) {
+      // TODO(creis): Do we need to stop loading in the frame?
+      DLOG(INFO) << "Skipping OpenURL for fallback to about:blank";
+      return;
+    }
   }
 
   OpenURL(params, GetSiteInstance());