DevTools: fix old shadow dom in DOMLinkifier
DevTools: fix old shadow dom in DOMLinkifier

Bug: 929561
Change-Id: I98ec6ea3cc6a6de1d82489a737cd5f51f9bc56f0
Reviewed-on: https://chromium-review.googlesource.com/c/1457919
Reviewed-by: Dmitry Gozman <0ca14b32cbb359a30ac562af27dd84cc2813eacb@chromium.org>
Commit-Queue: Erik Luo <26192f5e05d23e5ee959014fb911d780e566545b@chromium.org>
Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#629953}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: a62e482dc280ffa33572d9dc606cb61208192f5b
ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend