[DevTools] Don't show image preview on failed requests
[DevTools] Don't show image preview on failed requests

Bug: 871998
Change-Id: I7b1f69418ccae1d8e8edc867f7264d571b3986b3
Reviewed-on: https://chromium-review.googlesource.com/c/1277246
Commit-Queue: Joey Arhar <b82f612a3ddcfbac27d1758ce0a3eba47bee1116@chromium.org>
Reviewed-by: Dmitry Gozman <0ca14b32cbb359a30ac562af27dd84cc2813eacb@chromium.org>
Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#600091}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 75e890c93616d0eca19c8aa67fec2133bcf7756e
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