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This temporarily disables 4 network tool tests that will be
rebaselined and re-enabled after
https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/1881592
has landed and DEPS has rolled

Bug: 963183
Change-Id: Ifb2607ffc690f7b8225bcb5635cecd28f112a58e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1893515Reviewed-by: Lorne Mitchell <lomitch@microsoft.com>
Commit-Queue: Brandon Goddard <brgoddar@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#711385}