Add an error page for resources blocked via XSS Auditor.

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 8f75c8c80271d9285366d8ccd3a3188ed594ff00..d8b05a7d9908f15a68f59d75142ea7e0f0ef40e9 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -2479,6 +2479,22 @@ void RenderFrameImpl::LoadURLExternally(const blink::WebURLRequest& request,
   loadURLExternally(request, policy, WebString(), false);
 }
 
+void RenderFrameImpl::loadErrorPage(int reason) {
+  blink::WebURLError error;
+  error.unreachableURL = frame_->document().url();
+  error.domain = WebString::fromUTF8(net::kErrorDomain);
+  error.reason = reason;
+
+  std::string error_html;
+  GetContentClient()->renderer()->GetNavigationErrorStrings(
+      this, frame_->dataSource()->request(), error, &error_html, nullptr);
+
+  frame_->loadData(error_html, WebString::fromUTF8("text/html"),
+                   WebString::fromUTF8("UTF-8"), GURL(kUnreachableWebDataURL),

[Tom Sepez, 2016/10/20 18:26:58]

Maybe truncate the ? and # portions of the url?

+                   error.unreachableURL, true, blink::WebFrameLoadType::Standard,
+                   blink::WebHistoryItem(), blink::WebHistoryDifferentDocumentLoad, true);
+}
+
 void RenderFrameImpl::ExecuteJavaScript(const base::string16& javascript) {
   OnJavaScriptExecuteRequest(javascript, 0, false);
 }