DevTools: do not steal focus from the styles sidebar while editing.
DevTools: do not steal focus from the styles sidebar while editing.

Bug: 917477
Change-Id: Ibf881ccc9577a6aa380c07b613042395567fb39d
Reviewed-on: https://chromium-review.googlesource.com/c/1388751
Reviewed-by: Dmitry Gozman <0ca14b32cbb359a30ac562af27dd84cc2813eacb@chromium.org>
Commit-Queue: Pavel Feldman <e1161d7019a0d5c7981e3c3ffc69c76f4b09679a@chromium.org>
Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#618645}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: f01e9f40e7d86bb59fe09456d673de7ba19d9c11
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