DEBUG_DEVTOOLS behaves differently and falls back to the bundled version, that's why we don't see these failures.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/9c08889d47139672b311b30e9075a57459a6ec86

commit 9c08889d47139672b311b30e9075a57459a6ec86
Author: pfeldman <pfeldman@chromium.org>
Date: Mon Mar 20 21:25:09 2017

DevTools: [regression] remote debugging to a tcp port does not work via chrome:inspect

BUG= 702473 

Review-Url: https://codereview.chromium.org/2752423002
Cr-Commit-Position: refs/heads/master@{#458191}

[modify] https://crrev.com/9c08889d47139672b311b30e9075a57459a6ec86/chrome/browser/devtools/devtools_window.cc
[modify] https://crrev.com/9c08889d47139672b311b30e9075a57459a6ec86/chrome/browser/devtools/devtools_window.h
[modify] https://crrev.com/9c08889d47139672b311b30e9075a57459a6ec86/chrome/browser/ui/webui/devtools_ui.cc