(Re-)introduce AncestorThrottle to handle 'X-Frame-Options'.

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index f68bb2e5666f71404361907fd889992464b5d5cf..e66143a6dc1bbc47f99d30bc9cf0248496c8bca6 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -2374,6 +2374,18 @@ void RenderFrameImpl::LoadNavigationErrorPage(
   const blink::WebHistoryItem& history_item =
       entry ? entry->root() : blink::WebHistoryItem();
 
+  // Requests blocked by the X-Frame-Options HTTP response header doesn't

[clamy, 2016/12/16 15:21:43]

nit: s/doesn't/don't

[arthursonzogni, 2016/12/19 12:01:19]

Done.

+  // display error pages but a blank page instead.
+  // TODO(alexmos, mkwst, arthursonzogni): This block can be removed once error
+  // pages are refactored. See crbug.com/588314 and crbug.com/622385.
+  if (error.reason == net::ERR_BLOCKED_BY_RESPONSE) {
+    frame_->loadData("", WebString::fromUTF8("text/html"),
+                     WebString::fromUTF8("UTF-8"), GURL("data:,"), WebURL(),
+                     replace, frame_load_type, history_item,
+                     blink::WebHistoryDifferentDocumentLoad, false);
+    return;
+  }
+
   frame_->loadData(error_html, WebString::fromUTF8("text/html"),
                    WebString::fromUTF8("UTF-8"), GURL(kUnreachableWebDataURL),
                    error.unreachableURL, replace, frame_load_type, history_item,