Add an error page for resources blocked via XSS Auditor.

components/error_page_strings.grdp

Index: components/error_page_strings.grdp
diff --git a/components/error_page_strings.grdp b/components/error_page_strings.grdp
index a30640b33884409450e2a112cf19de5c6befce83..a44adf4c74ffcf0877339d7c696411996721751e 100644
--- a/components/error_page_strings.grdp
+++ b/components/error_page_strings.grdp
@@ -260,6 +260,9 @@
   <message name="IDS_ERRORPAGES_SUMMARY_BLOCKED_BY_EXTENSION" desc="Summary in the error page when an extension blocks a request.">
     Requests to the server have been blocked by an extension.
   </message>
+  <message name="IDS_ERRORPAGES_SUMMARY_BLOCKED_BY_AUDITOR" desc="Summary in the error page when the XSS Auditor blocks a response.">
+    This page may contain maliciously injected script.

[mmenke, 2016/10/24 14:44:43]

"a maliciously injected script." or "maliciously injected scripts."

Should we include more detail here?  The network stack team will be getting
reports of this error, and I have absolutely no clue what this means was the
actual problem.  A clearer error code would also work...What auditor?

+  </message>
   <message name="IDS_ERRORPAGES_SUMMARY_BLOCKED_BY_ADMINISTRATOR" desc="Summary in the error page when an administrator policy blocks a request.">
     The person who set up this computer has chosen to block this site.
   </message>