[DevTools] fixed coverage in Node.js frontend

We should not check for resource tree model when inspecting Node.js
target.

R=dgozman@chromium.org

Bug: chromium:787754
Change-Id: I04503a249acc05182524da40f83765e6ad7c37a5
Reviewed-on: https://chromium-review.googlesource.com/881468
Commit-Queue: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#531342}
1 file changed