Revert of Roll third_party/custom_tabs_client (patchset #1 id:1 of https://codereview.chromium.org/1254383014/)
Revert of Roll third_party/custom_tabs_client (patchset #1 id:1 of https://codereview.chromium.org/1254383014/)

Reason for revert:
speculative revert, prevents clank roll downstream, see crbug.com/515457

Original issue's description:
> Roll third_party/custom_tabs_client
>
> Roll from 6bae8bf337d5c51184c0c01f5baca3e0858 to
> 19d5cb35bece11876e8f34c17c6fdfd9bad.
>
> BUG=510083
>
> Committed: https://crrev.com/dc731ce3111a8d4f316e478601707cc33e70e542
> Cr-Commit-Position: refs/heads/master@{#341048}

TBR=yusufo@chromium.org,ianwen@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=510083

Review URL: https://codereview.chromium.org/1263983002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#341100}

Just-D/chromium-1,Chilledheart/chromium,Pluto-tv/chromium-crosswalk,Pluto-tv/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,Just-D/chromium-1,Chilledheart/chromium,Just-D/chromium-1,Chilledheart/chromium,Pluto-tv/chromium-crosswalk,Just-D/chromium-1,Chilledheart/chromium,axinging/chromium-crosswalk,Pluto-tv/chromium-crosswalk,Chilledheart/chromium,axinging/chromium-crosswalk,Just-D/chromium-1,Pluto-tv/chromium-crosswalk,Just-D/chromium-1,Chilledheart/chromium,axinging/chromium-crosswalk,Chilledheart/chromium,axinging/chromium-crosswalk,Chilledheart/chromium,axinging/chromium-crosswalk,Pluto-tv/chromium-crosswalk,Pluto-tv/chromium-crosswalk,axinging/chromium-crosswalk,Pluto-tv/chromium-crosswalk,Just-D/chromium-1,Just-D/chromium-1,axinging/chromium-crosswalk,axinging/chromium-crosswalk,Chilledheart/chromium,Pluto-tv/chromium-crosswalk,Just-D/chromium-1