Fix loading success.html at the end of chrome://chrome-signin flow

extensions/browser/url_request_util.cc

Index: extensions/browser/url_request_util.cc
diff --git a/extensions/browser/url_request_util.cc b/extensions/browser/url_request_util.cc
index 20e32c61b77d19208bb7ce156c7bc4a895d2415c..ec581dd6cf1d7141a3091710d24425f3f97f9640 100644
--- a/extensions/browser/url_request_util.cc
+++ b/extensions/browser/url_request_util.cc
@@ -155,7 +155,13 @@ bool AllowCrossRendererResourceLoadHelper(bool is_guest,
   if (is_guest) {
     // An extension's resources should only be accessible to WebViews owned by
     // that extension.
-    if (owner_extension != extension) {
+    // The only exception is the sign-in extension loaded by

[lfg, 2017/04/26 16:24:18]

Please, add a TODO that this should be removed once issue 688565 is fixed.

[msarda, 2017/04/27 12:28:45]

Done.

+    // chrome://chrome-signin, which is allowed to load web-accessible resources
+    // even if the webview that is loading the resource does not belong to the
+    // extension.
+    bool is_signin_extension =
+        extension && extension->id() == "mfffpogegjflfpflabcdkioaeobkgjik";
+    if (owner_extension != extension && !is_signin_extension) {
       *allowed = false;
       return true;
     }