Prevent renderer kills for in-page navigations on subframes.

content/renderer/render_frame_impl.h

Index: content/renderer/render_frame_impl.h
diff --git a/content/renderer/render_frame_impl.h b/content/renderer/render_frame_impl.h
index 6f52d2e94c684f80858f141cddbeef8a20de33f9..8ff197dce936abb09e11c562449f9d95a081adab 100644
--- a/content/renderer/render_frame_impl.h
+++ b/content/renderer/render_frame_impl.h
@@ -245,6 +245,10 @@ class CONTENT_EXPORT RenderFrameImpl
   // to using RenderFrame instead of RenderView.
   RenderViewImpl* render_view() { return render_view_.get(); }
 
+  const blink::WebHistoryItem& current_history_item() {
+    return current_history_item_;
+  }
+
   RendererWebCookieJarImpl* cookie_jar() { return &cookie_jar_; }
 
   // Returns the RenderWidget associated with this frame.